voice problems with gsm gateway

[Support Albakom]

hi,

we connecting a Quescom 300 GSM gateway to Cisco Callmanager 8.6 via SIP Trunk. We call a number and the call is established and connected. But nothing is hear end-to-end in both directions (no voice while connected). We sniffed the packets and see many RTP packets with right codec and so on.

Anybody had the same? Can somebody provide me with a configuration guide from quescom connection to cisco callmanager 8.x? Its possible that the payload type or framesize be the issue?

Thanks for any suggestions!

[Ramprasath Sadasivam]

Hi,

Did you get the solution for this?. If so can you share the solution . It might help me to solve this issue.

thanks in advance

regards

Ram

[Vadym Maliarov]

You mentioned RTP packets. What is the source and destination address? (Is it on telco side?)

Have you tried to decode RTP stream?

Check outgoing RTP packets. If they contain "normal voice" -  the issue isn't on CUCM

Check incomming RTP packets. What do you hear if you decode them?

Vadym

[maheshgunaratne]

Hi,

I have same issue with topex mobilink ip gsm gateway.

call connected with no audio but this issue only for a outgoing calls from my extension. no issues with incoming to internal extension.

any advice plz.

[Tagir Temirgaliyev]

I did connected CUBE 2921  to mobile providers by SIP trunk directly not throw gsm gateway.

I think it is better than gsm gateway

in your case if gateway connected by sip so do

clea logg

deb cssip mess

make call

sh logg

and copy paste log here