Users does not hear answering machines and PSTN messages
We are experiencing issues when we place a call to the PSTN and it is redirected to a answering machine, for example if I place a call to my cell phone and it is powered off normally it will be answered by the voice mail of my celular company, but in this case whe have two strange behaviors:
1.- the call keeps ringing like my cell phone were available.
2.- the call is connected but we are experiencing something like one way audio, we cannot hear audio from the voicemail, but checking my voice mail on my cell phone I realized that I am able to leave a message.
This two issues occours randomly and for both home answering machines and cell phones voicemails, with regular calls we have no problems.
GW 3900 - 15.1 (4) M7
The GW is connected with the CUCM via SIP, and with the PSTN with E1 R2.
Phone > CUCM > SIP > Gateway > E1 R2 > PSTN
Here is part of the configuration that I think could be relevant:
voice call convert-discpi-to-prog
voice service voip
no ip address trusted authenticate
allow-connections sip to sip
signaling forward unconditional
bind control source-interface Loopback0
bind media source-interface Loopback0
min-se 360 session-expires 360
voice rtp send-recv
controller E1 3/1
ds0-group 0 timeslots 1-15,17-31 type r2-digital r2-compelled ani
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