I have a Nortel CS1000M-MG PBX connected to my Cisco 2911 gateway using 6 FXO ports. When the PSTN user hangs up (PSTN->Nortel->Cisco), I do not get a SIP BYE from the Cisco 2911. I see through various debugs (debug vpm signal, debug vpm all, debug vpm dsp, debug voip vtsp all,debug voip ccapi all) that the disocnnect is being interpreted correctly by (some of) the gateway, but no SIP message is generated and the voice port light stays on. Any idea what I should do to debug this issue?
For example, I see (excerpted):
002158: Nov 4 18:29:47.824 UTC: htsp_process_event: [0/0/0, FXOLS_CONNECT, E_DSP_SIG_1100]fxols_offhook_disc
002159: Nov 4 18:29:47.824 UTC: htsp_timer2 - 350 msec
002162: Nov 4 18:29:48.176 UTC: htsp_process_event: [0/0/0, FXOLS_CONNECT, E_HTSP_EVENT_TIMER2]fxols_disc_confirm
002170: Nov 4 18:29:48.176 UTC: //12695/48A18893B2C6/VTSP:(0/0/0):-1:1:1/vtsp_set_release_source:
Release Direction=PSTN, Release Source=Calling Party-PSTN
002171: Nov 4 18:29:48.176 UTC: //12695/48A18893B2C6/VTSP:(0/0/0):-1:1:1/vtsp_cc_call_disconnected:
002172: Nov 4 18:29:48.176 UTC: //12695/48A18893B2C6/VTSP:(0/0/0):-1:1:1/vtsp_cc_call_disconnected:
Cause Value=16
002190: Nov 4 18:29:48.176 UTC: //12695/48A18893B2C6/CCAPI/ccCallDisconnect:
Cause Value=16, Tag=0x0, Call Entry(Previous Disconnect Cause=0, Disconnect Cause=16)
002376: Nov 4 18:29:51.872 UTC: htsp_dsp_message: SEND/RESP_SIG_STATUS: state=0x4 timestamp=0 systime=8904309
002377: Nov 4 18:29:51.872 UTC: htsp_process_event: [0/0/0, FXOLS_ONHOOK, E_DSP_SIG_0100]
