one-way audio during conference with h323 inter-cluster trunk call

[helawamry]

I have cluster pub and 2 sub with CCM(4.2.3) SR2b, i can make offnet call through h323 intercluster trunk connected to GSM GW but when i make conference with it and i can hear him but he couldn't hear me.

notice CFE software of all the CCM is registered.

Regards

Haitham,

[Rob Huffman]

Hi Haitham,

This really sounds like a Codec issue. Have a look;

Cisco CallManager Software Conference Bridge supports only G.711 a-law and G.711 u-law and does not understand any other codec such as G.729. External callers cannot be added to the conference if they use a codec other than G.711. In order for calls that originate as G.729 to be connected with phones that use G.711, you need to use a transcoder.

From this Conferencing doc;

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a008009476a.shtml

Hope this helps!

Rob

[helawamry]

Thanks Rob for your useful information.