[cisco-voip] ISDN sudden disconnect.

[Tanner Ezell]

I have a MGCP gateway connected via PRI. Whenever a call comes in from the
PRI, the IP Phone rings a single time and then disconnects. On the gateway,
debug isdn q931 reports:
*Mar  1 11:04:27.327: ISDN Se1/0:23 Q931: RX <- SETUP pd = 8  callref =
0x0008
Bearer Capability i = 0x8090A2
Standard = CCITT
Transfer Capability = Speech
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xE1808397
Preferred, Interface 0, Channel 23
Calling Party Number i = 0x00C0, N/A
Plan:Unknown, Type:Unknown
Called Party Number i = 0xA1, '5032733100'
Plan:ISDN, Type:National
*Mar  1 11:04:27.343: ISDN Se1/0:23 Q931: TX -> RELEASE_COMP pd = 8  callref
= 0x8008
Cause i = 0x80A9 - Temporary failure

I'm wondering if this is a dsp issue, as a call into the POTS line works
fine, but sending that call to an IP Phone I get this issue. Any
suggestions?
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