CME SIP REGISTER issue

Hello, I am trying to register my CP-7941G phone to my CME. The phone used to register with CUCM (177.1.10.10). Now it still restering to CUCM though the tftp server is CME. But the phone is unstable as it keep restarting and registering every once a few minutes.The phone's IP is 177.3.11.102. I did try to connect the phone to CUCM and change the firmware to SIP firware. Now it's using SIP41.9-0-2SR1S.  I don't why it cannot register. Any suggestion would be appreciated. Thank you.

Here is some information:


CME#debug tftp ev
CME#debug tftp events
TFTP Event debugging is on
CME#debug tftp pack
CME#debug tftp packets
TFTP Packet debugging is on
CME#
CME#

There is no debug output

CME#s ver
Cisco IOS Software, 3700 Software (C3745-ENTSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)

CME#show telephony-service
telephony-service is not enabled

CME#show voice register tftp-bind
tftp-server syncinfo.xml url flash:/syncinfo.xml
tftp-server SIPDefault.cnf url flash:/SIPDefault.cnf
tftp-server softkeyDefault_kpml.xml url flash:/softkeyDefault_kpml.xml
tftp-server softkeyDefault.xml url flash:/softkeyDefault.xml
tftp-server OS79XX.TXT url flash:/OS79XX.TXT

CME#sh ip dhcp binding
Bindings from all pools not associated with VRF:
IP address          Client-ID/              Lease expiration        Type
                    Hardware address/
                    User name
177.3.11.100        0100.21a0.8666.af       Aug 16 2008 12:16 PM    Automatic
177.3.11.102        0100.1c58.1cb0.f3       Aug 16 2008 11:20 AM    Automatic

 

some of the output from show run:


no ip dhcp use vrf connected
ip dhcp excluded-address 177.3.11.1 177.3.11.99
ip dhcp excluded-address 177.3.11.200 177.3.11.255
!
ip dhcp pool Voice
   network 177.3.11.0 255.255.255.0
   option 150 ip 177.3.11.1
   default-router 177.3.11.1


voice service voip
 allow-connections sip to sip
 sip
  bind control source-interface FastEthernet0/0.11
  bind media source-interface FastEthernet0/0.11
  registrar server expires max 1200 min 300
  no update-callerid

voice register global
 mode cme
 source-address 177.3.11.1 port 5060
 max-dn 10
 max-pool 5
 load 7960-7940 P0s3-08-8-00
 load 7941GE SIP41.8-2-1S.loads
 load 7941 SIP41.8-2-1S.loads
 authenticate register
 tftp-path flash:
 create profile sync 0218368833093059
!
voice register dn  1
 number 3002
 name Br2Ph2
 label Br2 3002
!
voice register pool  1
 id mac 001C.581C.B0F3
 type 7941
 number 1 dn 1
 dtmf-relay sip-notify
 username 3005 password cisco
 codec g711ulaw

 

tftp-server flash:P003-08-8-00.bin
tftp-server flash:P003-08-8-00.sbn
tftp-server flash:P0S3-08-8-00.loads
tftp-server flash:P0S3-08-8-00.sb2
tftp-server flash:apps41.8-2-0-55.sbn
tftp-server flash:cnu41.8-2-0-55.sbn
tftp-server flash:cvm41sip.8-2-0-55.sbn
tftp-server flash:dsp41.8-2-0-55.sbn
tftp-server flash:jar41sip.8-2-0-55.sbn
tftp-server flash:ad
tftp-server flash:SIP41.8-2-1S.loads
tftp-server flash:term41.default.loads
tftp-server flash:term61.default.loads

 

CME#sh flash:
-#- --length-- -----date/time------ path
1       237318 Mar 24 2008 23:22:26 crashinfo_20080324-232227
2      2356238 Aug 14 2008 20:55:38 gui/apps41.8-2-0-55.sbn
3     40229100 Mar 11 2008 00:34:54 c3745-entservicesk9-mz.124-15.T1.bin
4            0 Jul 02 2008 02:54:00 bacdprompts
5        18836 Jul 02 2008 02:54:02 bacdprompts/app-b-acd-2.1.2.2-ReadMe.txt
6        24985 Jul 02 2008 02:54:02 bacdprompts/app-b-acd-2.1.2.2.tcl
7        35485 Jul 02 2008 02:54:02 bacdprompts/app-b-acd-aa-2.1.2.2.tcl
8        75650 Jul 02 2008 02:54:02 bacdprompts/en_bacd_allagentsbusy.au
9        83291 Jul 02 2008 02:54:04 bacdprompts/en_bacd_disconnect.au
10       63055 Jul 02 2008 02:54:04 bacdprompts/en_bacd_enter_dest.au
11       37952 Jul 02 2008 02:54:06 bacdprompts/en_bacd_invalidoption.au
12      496521 Jul 02 2008 02:54:06 bacdprompts/en_bacd_music_on_hold.au
13      123446 Jul 02 2008 02:54:08 bacdprompts/en_bacd_options_menu.au
14       42978 Jul 02 2008 02:54:08 bacdprompts/en_bacd_welcome.au
15       34794 Jul 02 2008 02:54:08 bacdprompts/en_bacd_xferto_operator.au
16       22542 Jul 02 2008 02:54:10 CME-7-0-full-readme-v.1.0.txt
17           0 Jul 02 2008 02:54:10 Desktops
18           0 Jul 02 2008 02:54:10 Desktops/320x212x12
19      131470 Jul 02 2008 02:54:12 Desktops/320x212x12/CampusNight.png
20       80565 Jul 02 2008 02:54:12 Desktops/320x212x12/CiscoFountain.png
21         628 Jul 02 2008 02:54:12 Desktops/320x212x12/List.xml
22      109076 Jul 02 2008 02:54:14 Desktops/320x212x12/MorroRock.png
23      108087 Jul 02 2008 02:54:14 Desktops/320x212x12/NantucketFlowers.png
24       10820 Jul 02 2008 02:54:14 Desktops/320x212x12/TN-CampusNight.png
25        9657 Jul 02 2008 02:54:14 Desktops/320x212x12/TN-CiscoFountain.png
26        7953 Jul 02 2008 02:54:16 Desktops/320x212x12/TN-Fountain.png
27        7274 Jul 02 2008 02:54:16 Desktops/320x212x12/TN-MorroRock.png
28        9933 Jul 02 2008 02:54:16 Desktops/320x212x12/TN-NantucketFlowers.png
29      138278 Jul 02 2008 02:54:18 Desktops/320x212x12/Fountain.png
30           0 Jul 02 2008 02:54:18 gui
31        3987 Jul 02 2008 02:54:18 gui/admin_user.html
32      650596 Jul 02 2008 02:54:20 gui/admin_user.js
33        1029 Jul 02 2008 02:54:22 gui/CiscoLogo.gif
34         617 Jul 02 2008 02:54:22 gui/CME_GUI_README.TXT
35         953 Jul 02 2008 02:54:22 gui/Delete.gif
36       16344 Jul 02 2008 02:54:22 gui/dom.js
37         864 Jul 02 2008 02:54:24 gui/downarrow.gif
38        6146 Jul 02 2008 02:54:24 gui/ephone_admin.html
39        4558 Jul 02 2008 02:54:24 gui/logohome.gif
40        3866 Jul 02 2008 02:54:24 gui/normal_user.html
41       78428 Jul 02 2008 02:54:26 gui/normal_user.js
42        1347 Jul 02 2008 02:54:26 gui/Plus.gif
43         843 Jul 02 2008 02:54:26 gui/sxiconad.gif
44         174 Jul 02 2008 02:54:28 gui/Tab.gif
45        2431 Jul 02 2008 02:54:28 gui/telephony_service.html
46         870 Jul 02 2008 02:54:28 gui/uparrow.gif
47        9968 Jul 02 2008 02:54:28 gui/xml-test.html
48        3412 Jul 02 2008 02:54:30 gui/xml.template
49      496521 Jul 02 2008 02:54:30 music-on-hold.au
50           0 Jul 02 2008 02:54:32 phone
51           0 Jul 02 2008 02:54:32 phone/7945-7965
52     2496963 Jul 02 2008 02:54:38 phone/7945-7965/apps45.8-3-2-27.sbn
53      585536 Jul 02 2008 02:54:40 phone/7945-7965/cnu45.8-3-2-27.sbn
54     2453202 Jul 02 2008 02:54:46 phone/7945-7965/cvm45sccp.8-3-2-27.sbn
55      326315 Jul 02 2008 02:54:48 phone/7945-7965/dsp45.8-3-2-27.sbn
56      555406 Jul 02 2008 02:54:50 phone/7945-7965/jar45sccp.8-3-2-27.sbn
57         638 Jul 02 2008 02:54:50 phone/7945-7965/SCCP45.8-3-3S.loads
58         642 Jul 02 2008 02:54:50 phone/7945-7965/term45.default.loads
59         642 Jul 02 2008 02:54:50 phone/7945-7965/term65.default.loads
60           0 Jul 02 2008 02:54:52 phone/7937
61     7821474 Jul 02 2008 02:55:10 phone/7937/apps37sccp.1-1-1-1.bin
62           0 Jul 02 2008 02:55:10 phone/7914
63       49986 Jul 02 2008 02:55:12 phone/7914/S00105000300.sbn
64           0 Jul 02 2008 02:55:12 phone/7906-7911
65     2496963 Jul 02 2008 02:55:18 phone/7906-7911/apps11.8-3-2-27.sbn
66      551014 Jul 02 2008 02:55:20 phone/7906-7911/cnu11.8-3-2-27.sbn
67     2387207 Jul 02 2008 02:55:28 phone/7906-7911/cvm11sccp.8-3-2-27.sbn
68      326315 Jul 02 2008 02:55:28 phone/7906-7911/dsp11.8-3-2-27.sbn
69      307192 Jul 02 2008 02:55:30 phone/7906-7911/jar11sccp.8-3-2-27.sbn
70         658 Jul 02 2008 02:55:30 phone/7906-7911/SCCP11.8-3-3S.loads
71         662 Jul 02 2008 02:55:30 phone/7906-7911/term06.default.loads
72         662 Jul 02 2008 02:55:32 phone/7906-7911/term11.default.loads
73           0 Jul 02 2008 02:55:32 phone/7920
74     1155568 Jul 02 2008 02:55:34 phone/7920/cmterm_7920.4.0-03-02.bin
75           0 Jul 02 2008 02:55:36 phone/7931
76     2496963 Jul 02 2008 02:55:40 phone/7931/apps31.8-3-2-27.sbn
77      551890 Jul 02 2008 02:55:44 phone/7931/cnu31.8-3-2-27.sbn
78     2382491 Jul 02 2008 02:55:48 phone/7931/cvm31sccp.8-3-2-27.sbn
79      326315 Jul 02 2008 02:55:50 phone/7931/dsp31.8-3-2-27.sbn
80      308573 Jul 02 2008 02:55:52 phone/7931/jar31sccp.8-3-2-27.sbn
81         639 Jul 02 2008 02:55:52 phone/7931/SCCP31.8-3-3S.loads
82         643 Jul 02 2008 02:55:54 phone/7931/term31.default.loads
83           0 Jul 02 2008 02:55:54 phone/7942-7962
84     2496963 Jul 02 2008 02:56:00 phone/7942-7962/apps42.8-3-2-27.sbn
85      585562 Jul 02 2008 02:56:02 phone/7942-7962/cnu42.8-3-2-27.sbn
86     2452185 Jul 02 2008 02:56:08 phone/7942-7962/cvm42sccp.8-3-2-27.sbn
87      326315 Jul 02 2008 02:56:10 phone/7942-7962/dsp42.8-3-2-27.sbn
88      443607 Jul 02 2008 02:56:10 phone/7942-7962/jar42sccp.8-3-2-27.sbn
89         658 Jul 02 2008 02:56:12 phone/7942-7962/SCCP42.8-3-3S.loads
90         662 Jul 02 2008 02:56:12 phone/7942-7962/term42.default.loads
91         662 Jul 02 2008 02:56:12 phone/7942-7962/term62.default.loads
92           0 Jul 02 2008 02:56:12 phone/7921
93     2559783 Jul 02 2008 02:56:18 phone/7921/APPS-1.1.1.SBN
94         894 Jul 02 2008 02:56:20 phone/7921/CP7921G-1.1.1.LOADS
95     1787806 Jul 02 2008 02:56:24 phone/7921/GUI-1.1.1.SBN
96     2083047 Jul 02 2008 02:56:30 phone/7921/SYS-1.1.1.SBN
97      895905 Jul 02 2008 02:56:32 phone/7921/TNUX-1.1.1.SBN
98     2196478 Jul 02 2008 02:56:38 phone/7921/TNUXR-1.1.1.SBN
99     1339790 Jul 02 2008 02:56:42 phone/7921/WLAN-1.1.1.SBN
100          0 Jul 02 2008 02:56:42 phone/7940-7960
101     129824 Jul 02 2008 02:56:44 phone/7940-7960/P00308000500.bin
102        458 Jul 02 2008 02:56:44 phone/7940-7960/P00308000500.loads
103     705536 Jul 02 2008 02:56:46 phone/7940-7960/P00308000500.sb2
104     130228 Jul 02 2008 02:56:46 phone/7940-7960/P00308000500.sbn
105          0 Jul 02 2008 02:56:48 phone/7970-7971
106    2494499 Jul 02 2008 02:56:52 phone/7970-7971/apps70.8-3-2-27.sbn
107     547706 Jul 02 2008 02:56:54 phone/7970-7971/cnu70.8-3-2-27.sbn
108    2456051 Jul 02 2008 02:57:02 phone/7970-7971/cvm70sccp.8-3-2-27.sbn
109     530601 Jul 02 2008 02:57:04 phone/7970-7971/dsp70.8-3-2-27.sbn
110     538527 Jul 02 2008 02:57:06 phone/7970-7971/jar70sccp.8-3-2-27.sbn
111        638 Jul 02 2008 02:57:06 phone/7970-7971/SCCP70.8-3-3S.loads
112        642 Jul 02 2008 02:57:06 phone/7970-7971/term70.default.loads
113        642 Jul 02 2008 02:57:06 phone/7970-7971/term71.default.loads
114          0 Jul 02 2008 02:57:08 phone/7975
115    2496963 Jul 02 2008 02:57:12 phone/7975/apps75.8-3-2-27.sbn
116     585532 Jul 02 2008 02:57:14 phone/7975/cnu75.8-3-2-27.sbn
117    2453636 Jul 02 2008 02:57:20 phone/7975/cvm75sccp.8-3-2-27.sbn
118     326315 Jul 02 2008 02:57:22 phone/7975/dsp75.8-3-2-27.sbn
119     557786 Jul 02 2008 02:57:24 phone/7975/jar75sccp.8-3-2-27.sbn
120        638 Jul 02 2008 02:57:24 phone/7975/SCCP75.8-3-3S.loads
121        642 Jul 02 2008 02:57:26 phone/7975/term75.default.loads
122          0 Jul 02 2008 02:57:26 phone/7941-7961
123    2494499 Jul 02 2008 02:57:32 phone/7941-7961/apps41.8-3-2-27.sbn
124     547146 Jul 02 2008 02:57:34 phone/7941-7961/cnu41.8-3-2-27.sbn
125    2452629 Jul 02 2008 02:57:40 phone/7941-7961/cvm41sccp.8-3-2-27.sbn
126     530601 Jul 02 2008 02:57:42 phone/7941-7961/dsp41.8-3-2-27.sbn
127     315827 Jul 02 2008 02:57:44 phone/7941-7961/jar41sccp.8-3-2-27.sbn
128        638 Jul 02 2008 02:57:44 phone/7941-7961/SCCP41.8-3-3S.loads
129        642 Jul 02 2008 02:57:44 phone/7941-7961/term41.default.loads
130        642 Jul 02 2008 02:57:46 phone/7941-7961/term61.default.loads
131          0 Jul 02 2008 02:57:46 ringtones
132       8160 Jul 02 2008 02:57:46 ringtones/Analog1.raw
133       8160 Jul 02 2008 02:57:46 ringtones/Analog2.raw
134       5280 Jul 02 2008 02:57:48 ringtones/AreYouThere.raw
135       5040 Jul 02 2008 02:57:48 ringtones/AreYouThereF.raw
136       8160 Jul 02 2008 02:57:48 ringtones/Bass.raw
137      12240 Jul 02 2008 02:57:48 ringtones/CallBack.raw
138      16040 Jul 02 2008 02:57:50 ringtones/Chime.raw
139       8160 Jul 02 2008 02:57:50 ringtones/Classic1.raw
140      16080 Jul 02 2008 02:57:50 ringtones/Classic2.raw
141      10800 Jul 02 2008 02:57:52 ringtones/ClockShop.raw
142       2823 Jul 02 2008 02:57:52 ringtones/DistinctiveRingList.xml
143       9600 Jul 02 2008 02:57:52 ringtones/Drums1.raw
144      13440 Jul 02 2008 02:57:52 ringtones/Drums2.raw
145      15840 Jul 02 2008 02:57:54 ringtones/FilmScore.raw
146      16080 Jul 02 2008 02:57:54 ringtones/HarpSynth.raw
147       8160 Jul 02 2008 02:57:54 ringtones/Jamaica.raw
148      16080 Jul 02 2008 02:57:56 ringtones/KotoEffect.raw
149      12720 Jul 02 2008 02:57:56 ringtones/MusicBox.raw
150       8160 Jul 02 2008 02:57:56 ringtones/Piano1.raw
151      15360 Jul 02 2008 02:57:58 ringtones/Piano2.raw
152       9360 Jul 02 2008 02:57:58 ringtones/Pop.raw
153       7200 Jul 02 2008 02:57:58 ringtones/Pulse1.raw
154       4000 Jul 02 2008 02:58:00 ringtones/Ring1.raw
155       4000 Jul 02 2008 02:58:00 ringtones/Ring2.raw
156       4000 Jul 02 2008 02:58:00 ringtones/Ring3.raw
157       4000 Jul 02 2008 02:58:00 ringtones/Ring4.raw
158       4000 Jul 02 2008 02:58:02 ringtones/Ring5.raw
159       4000 Jul 02 2008 02:58:02 ringtones/Ring6.raw
160       4000 Jul 02 2008 02:58:02 ringtones/Ring7.raw
161        495 Jul 02 2008 02:58:02 ringtones/RingList.xml
162      10800 Jul 02 2008 02:58:04 ringtones/Sax1.raw
163      14160 Jul 02 2008 02:58:04 ringtones/Sax2.raw
164      16080 Jul 02 2008 02:58:04 ringtones/Vibe.raw
165        459 Jul 22 2008 11:37:24 P0S3-08-8-00.loads
166     755912 Jul 22 2008 11:39:08 P0S3-08-8-00.sb2
167     130548 Jul 22 2008 11:39:38 P003-08-8-00.bin
168     130952 Jul 22 2008 11:39:48 P003-08-8-00.sbn
169       3613 Aug 09 2008 17:13:10 softkeyDefault.xml
170     434445 Aug 14 2008 23:02:46 gui/cnu41.8-2-0-55.sbn
171       1825 Aug 09 2008 17:13:10 SIPDefault.cnf
172       3579 Aug 09 2008 17:13:10 softkeyDefault_kpml.xml
173         69 Aug 09 2008 17:13:08 syncinfo.xml
174    2475556 Aug 14 2008 23:03:14 gui/cvm41sip.8-2-0-55.sbn
175     492817 Aug 14 2008 23:03:30 gui/dsp41.8-2-0-55.sbn
176     230817 Aug 14 2008 23:03:44 gui/jar41sip.8-2-0-55.sbn
177        638 Aug 14 2008 23:03:50 gui/SIP41.8-2-1S.loads
178        642 Aug 14 2008 23:04:00 gui/term41.default.loads
179        642 Aug 14 2008 23:04:08 gui/term61.default.loads
180         13 Aug 15 2008 11:16:46 OS79XX.TXT

CME#more SIPDefault.cnf
image_version: "";
call_manager1_addr: "177.3.11.1";
call_manager2_addr: "";
call_manager3_addr: "";
call_manager1_sip_port: "5060";
call_manager2_sip_port: "";
call_manager3_sip_port: "";
proxy1_address: "USECALLMANAGER";
proxy2_address: "";
proxy3_address: "";
proxy4_address: "";
proxy5_address: "";
proxy6_address: "";
proxy1_port: "5060";
out put cut...

 

 

 

 

 

Comments

  • In your tftp-server statements, you have the 8-2-1S.loads file, as well as in your voice register global section, but in the rest of your tftp-server statements (for the dsp, cvm, cnu, apps, etc), you have the 8-2-0 files (as I've posted below). Correct those files to include the proper versioned files, then go into voice register global and perform a 'no create profile', then 'create profile', and then run the debug tftp events and recycle the power on the phone and copy us on the output. 





    Kind Regards,

    Mark Snow, CCIE #14073
    (Voice, Security)
    Instructor
    Internetwork Expert, Inc.
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    Toll Free: 877-224-8987
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    - docendo discitur





    On Aug 25, 2011, at 13:12, WilliamZ <[email protected]> wrote:

    tftp-server flash:P003-08-8-00.bin
    tftp-server flash:P003-08-8-00.sbn
    tftp-server flash:P0S3-08-8-00.loads
    tftp-server flash:P0S3-08-8-00.sb2
    tftp-server flash:apps41.8-2-0-55.sbn
    tftp-server flash:cnu41.8-2-0-55.sbn
    tftp-server flash:cvm41sip.8-2-0-55.sbn
    tftp-server flash:dsp41.8-2-0-55.sbn
    tftp-server flash:jar41sip.8-2-0-55.sbn
    tftp-server flash:ad
    tftp-server flash:SIP41.8-2-1S.loads
    tftp-server flash:term41.default.loads
    tftp-server flash:term61.default.loads
  • Thank you Mark.

    I found those firmware files from here:

    http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/requirements/guide/cme41spc.htm

    I think you suggest that I should find files like 8-2-1 files to match the 8-2-1S.loads file. But there is no files like that.

    I tried to change

     load 7941GE SIP41.8-2-1S.loads
     load 7941 SIP41.8-2-1S.loads

    as

     load 7941GE term41.default.loads
     load 7941 term41.default.loads

    This didn't work.

    I did the 'no create profile' and then 'create profile' everytime I changed it before I power cycle the phone.

    Debug doesn't show any output. And the phone just register to the CUCM like before.

     

    It looks like the phone doesn't get the right config file from CME. How does it know to register to CUCM? It must be the configuration from last time and it is still there.

     

    BTW, I have another case which I think it's similar to this one:

    I register 2 7941 phones easily to my UC 500 which is also runing CME. The phones upgrade the fireware and registered. I put another phone which is also registered to CUCM before now it has the similar situation. It keeps registering though it has the right TFTP , IP inforamtion from the UC 520. So I think the phone is trying to find the CUCM it registered before. I can still see the number in  the old description from the CUCM in the phone screen. This case is running SCCP.

    I go to phone's setting- Device Configuration - CallManager Configuration -  CallManager1 10.1.1.1 active

    another unregistered phone setting - Device Configuration - Unified CM Configuration - Unified CM1 - 177.1.10.10

    The 177.1.10.10 is the CUCM the phone registered with. It cannot get the right CUCM IP. I think this is relate to the config file

  • I have seen something similar many times before where the phone is using old TFTP server IP/config file (similar to caching behaviour). Usually I do a factory reset which fix the problem.

    Try to do factory reset and let us know the result. Use below link:

    http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a00800941bb.shtml

  • Thank you Baqari

    Yes, I think resetting the phone is the only way to get rid of the old config file if we cannot get a new config file from the tftp server.

    I fixed the problem. But unfortunately I don't know how exactly I fixed that.

    I found one mistake in my first post. When we load some files, there should be no extensions. For example, it should be "load SIP41.8-2-1S" instead of "load SIP41.8-2-1S.load".

    I was changing the files I load and keep creating profile to generate a new SIPDefaults.cnf.And then suddenly the phone was registering. I can only say it must because some sort of firmware and cnf files cause this issue besides the wrong command I mentioned above. The debug tftp events/packets generated no output at all in the whole process even when he  phone was donwloading files and upgrading firmware.  I don't know why.

    I found this article helpful too.

    http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmefiles.html#wp1023156

  • Good to hear this.

    Regarding TFTP packets which aren't displayed using debug when the phone registers with CME, could be you missed "term mon" command [;)]

    Else, you have to see tftp packets when you enable "debug tftp packets" if CME is used as your TFTP server.

     

     

  • Thank you Baqari,

      I just use that command "terminal monitor" and then the output comes out. I learned a lot today. Thank you and have a good day.

  • Williamz;

         I have had many similar problems with phone registrations as of late, when moving from one UCM platform to another.  We have noticed that when moving from one cluster to another, especially with 8.x and above, the security certificates (CTL/ITL) refuse to release, and behave as though the old one has priority, and refuses to allow overwriting of this file.  Our only way to correct this issue, is to do a factory reset.  We have even found that on 7942/62's, when we do a Settings->Security->CTL->Erase, that it does not work 75%< of the time.  I know that this doesn't tie directly to your question, but you said "I fixed the problem. But unfortunately I don't know how exactly I fixed that.", and I thought I would share this with you.  We have also had issues with the trust list not being deleted from the phones as well, but that is more with 8.5 and 9.x phone loads, than w/ 7.x.

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