Problem transferring calls between Voip phones when the call is originated

Hi,
I have configured a gateway h323 (3640- 12.3) to communicate with Cisco Callmanager 3.3(4).
On the H323 gateway I have installed one BRI interface and one FXS interface.
Inside my network I am using VoIP telephones 7910.
Originating calls in the Voip telephones which destination is the PSTN is working fine;
Receiving calls from PSTN that destination is VoIP telephones is OK also;
Redirecting or doing “Hold” on calls between VoiP telephones works but…..
When redirecting or doing “Hold” on calls between a VoiP telephone and a call from PSTN I loose the voice stream.
Apparently, all signalling is working fine because when redirecting the call originated in the PSTN from one VoIP telephone to another VoIP telephone, I can see the Calling number ID. Even if I use the telephone keyboard, I can listen the tones, but I have no voice stream.
Please any help will be welcome.
Thanks,
David Costa

I have tried different configurations and now it is working. The problem is that I couldn’t identify were the miss configuration was.
Another question is: Can I use a codec with compression between voip interface of h323 gateway and the Callmanager or Voip phones to pass music on hold?
Now I only pass music on hold if I configure G.711 on the voip interface of h323 gateway.
Thanks,
David Costa

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