E1 card can ring no voice

hello mate , i met some problem. the e1 card work wired . IPphone can ring but no sound (no ringback , no voice ,no busytone)

IPphone------2811 -------3640 ------------IPphone


config of 2811
isdn switch-type primary-net5
network-clock-participate wic 0
network-clock-select 1 E1 0/0/0

controller E1 0/0/0
 framing NO-CRC4
 pri-group timeslots 1-3,16

interface Serial0/0/0:15
 no ip address
 encapsulation hdlc
 isdn switch-type primary-net5
 isdn incoming-voice voice
 isdn outgoing display-ie
 isdn outgoing ie redirecting-number
 no cdp enable

voice-port 0/0/0:15

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