We have an issue with calls from PSTN. When we received a call from PSTN the caller hears an IVR and then press the option "2" then the caller should be transfered to extension 96537, that is another IVR, but the caller hears ringback and then the call is dropped.
it seems codec issue. have you configured 'early-offer forced' command in GW pointing to CUCM.
If I understand correctly, the inbound call coming from PSTN is transferred by CVP to GW and then to CUCM for extn: 96537.
The SIP Invite message from CVP to GW has no SDP. Also the SIP Invite from GW to CUCM has no SDP as it might be missing the EO Forced command.
in case if it is not configured previously, you can enable the Forced EO in 2 ways.
1) under the "voice service voip" -> "sip" configuration, configure 'early-offer forced'
2) under the dial-peer, the command will be "voice-class sip early-offer forced" . This will only take effect when the call hits this dial-peer while the previous command under "voice service voip" will have global effect. SDP info would be from the codecs configured under outgoing dial-peer.
Please ensure you configure the Outgoing Dial-peer=96537 with voice class codec consisting g711a, g711u & g729 codecs
when the GW sends the INVITE without SDP to CUCM, the CUCM sends the 200 OK message with G729 codec in the sdp.
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