Configuring Cisco router as a PSTN simulator

Hello guys. In this thread I would like to configure Cisco router as a PSTN simulator step-by-step and I would highly appreciate if you could help me with it. Below is the description of my lab equipment.

 

HQ:

Cisco 2811 

VWIC2-2MFT-T1/E1 (1st E1 for voice circuit and 2nd E1 for data circuit (Frame Relay)).

PVDM2-16 x 2

 

Branch 1:

Cisco 2811 

VWIC2-2MFT-T1/E1 (1st E1 for voice circuit and 2nd E1 for data circuit (Frame Relay))

PVDM2-16 x 2

 

Branch 2:

Cisco 2801 

VWIC2-2MFT-T1/E1 (1st E1 for voice circuit and 2nd E1 for data circuit (Frame Relay))

PVDM2-16 x 2

 

PSTN:

Cisco 2811

VWIC2-2MFT-T1/E1 (1st E1 for voice circuit and 2nd E1 for data circuit (Frame Relay)) to HQ.

VWIC2-2MFT-T1/E1 (1st E1 for voice circuit and 2nd E1 for data circuit (Frame Relay)) to BR1.

VWIC2-2MFT-T1/E1 (1st E1 for voice circuit and 2nd E1 for data circuit (Frame Relay)) to BR2.

PVDM2-16 x 2

 

For now, before configuring dial plan, I would like only to be sure that E1 PRI configuration is correct on branch routers and PSTN simulator. Below are configurations of E1 PRI on all routers:

 

HQ-RTR#show run

network-clock-participate wic 0

!

isdn switch-type primary-net5

!

controller E1 0/0/0

pri-group timeslots 1-10,16

description **VOICE CIRCUIT TO PSTN**

!

interface Serial0/0/0:15

description **VOICE CHANNEL**

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable


BR1-RTR#show run

network-clock-participate wic 0

!

isdn switch-type primary-net5

!

controller E1 0/0/0

pri-group timeslots 1-10,16

description **VOICE CIRCUIT TO PSTN**

!

interface Serial0/0/0:15

description **VOICE CHANNEL**

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable


BR2-RTR#show run

network-clock-participate wic 0

!

isdn switch-type primary-net5

!

controller E1 0/1/0

pri-group timeslots 1-10,16

description **VOICE CIRCUIT TO PSTN**

!

interface Serial0/1/0:15

description **VOICE CHANNEL**

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable


PSTN-RTR#show run

!

network-clock-participate wic 0 

network-clock-participate wic 1 

network-clock-participate wic 2

!

isdn switch-type primary-net5

!

controller E1 0/0/0

pri-group timeslots 1-10,16

description **VOICE CIRCUIT TO HQ-RTR**

!

controller E1 0/1/0

pri-group timeslots 1-10,16

description **VOICE CIRCUIT TO BR1-RTR**

!

controller E1 0/2/0

!

pri-group timeslots 1-10,16

description **VOICE CIRCUIT TO BR2-RTR**

!

interface Serial0/0/0:15

description **VOICE CHANNEL TO HQ-RTR**

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable

!

interface Serial0/1/0:15

description **VOICE CHANNEL TO BR1-RTR**

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable

!

interface Serial0/2/0:15

description **VOICE CHANNEL TO BR2-RTR**

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable

 

Is there anything I need to add in configuration on all routers (especially on PSTN-RTR)?

 

Comments

  • Do these configs not work? What specifically isn't working?

    INE has the pstn router configs. Not sure if you have the all access pass or not, but let's start with what's working and what's not with your configs.

     

    cheers,

    will

  • When I have the chance, I build my router configs from default before blindly copying and pasting someone else's work.  I step into more problems but it's an opportunity to learn.  I believe you have missed telling your PSTN router to emulate the network side of a voice PRI.  Google your situation leads to this:

    !PSTN router side needs to emulate network side otherwide circuit will not establish

    !L2 Status will remain TEI_ASSIGNED / AWAITING_ESTABLISHMENT

    !debug q931 reveals BAD FRAME()

    #isdn protocol-emulate network


    HTH


    Dave
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