Please can you let me know where i need to look for the below issues.
My client is having inbound issues with some inbound calls.
They have a UCM 6202 Firmware 220.127.116.11.
Codecs setting as PCMU/PCMA/G729
We reported this to the service provider and they have come back with the below:
Based on call traces we found your PBAX is sending two codecs while negotiating in 183 and 200 response back to Liquid.
Please note this could cause codec mismatch between the providers, Hence we recommend you configure PBAX to send single codec while negotiating in 183 and 200 response and share the results.
SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP 192.168.246.10:5060;rport=5060;received=192.168.246.10;branch=z9hG4bKjlhmtg2090hggdemfgh0.1
CSeq: 1 INVITE
Server: Grandstream UCM6202V1.5A 18.104.22.168
Allow: OPTIONS, INFO, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REGISTER, REFER
o=- 4048324761 61773499 IN IP4 192.168.246.250
c=IN IP4 192.168.246.250
m=audio 17218 RTP/AVP 18 0 101