On Wed, Apr 29, 2009 at 4:09 PM, Maarten De Maeyer <[email protected]> wrote: > If a sip user makes an external call via the internal sbc (and itsp), can he > transfer this call to another external number via the internal sbc ? So the > result will be 2 external phones talking. > It's not working for me, is this possible ?
Yes it is supported. The caller ( phone in the PBX) should be able to transfer the call to another PSTN number and the two parties can talk to each other. Several conditions need to be fulfilled for successful transfer. Note that the ITSPs should be able to handle re-INVITE ( some ITSPs dont and this is a bug with the ITSP therefore they cannot be supported ). A quick test - turn MOH off on the phone and ON on sipxbridge. Then make a call to the ITSP and put the ITSP on hold and remove hold. If that works, that is a good test that the re-INVITE is working correctly. If it is not working then your transfer will probably fail. Another possibility is Codec negotiation is failing for the transfer. i.e. the two PSTN phones are able to negotiate media with the PBX phone individually but there is no common codec between the two. This is a rare possibility but it can happen if the two PSTN phones are on different ITSPs. For example if the first PSTN phone (on ITSP1) negotiates G729 and only G729, the second PSTN phone (on ITSP2) negotiates only G711 then when the transfer occurs, no common codec can be negotiated between the two ends. To diagnose such problems I would need a sipx-snapshot of the scenario. Please run one and send it to me if you cannot figure it out. Regards Ranga > > Thanks > _______________________________________________ > sipx-users mailing list > [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-users > Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-users > -- M. Ranganathan _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-users
