Hello Ryan Based on what I think I learned correctly from the book "Cisco IP Communications Express - CallManager Express with Cisco Unity Express this call will always be hairpinned by CME.
CUCM uses the empty capability set standard (ECS) for its supplementary services while CME uses between few options, the H.450.3 standards for Call Forwards. This gets enabled by the telephony-services command "call-forward pattern .T" This is a method where you invoke the call replacement I believe is what you aiming for (where a signal is sent back to the calling party to re-originate the call to the forwarded-to destination) These two methods are not compatible. So as soon as your CME phone invokes the call transfer the following events happen: CME detects a call involving call manager by using special h323 IEs. If H450.3 is enabled then CME disables this mechanism and hairpins the call by using its built-in MTP resouces. So as far as I know your scenario cannot be achieved because as soon as the call is hairpinned then you have mismatching codecs configured between your CME dial-peers and the xcoder will be invoked. Please if someone disagrees speak up as I'm keen to confirm my understanding as well. Cheers Daniel On Tue, Jun 8, 2010 at 7:24 AM, Ryan Schwab <schwab...@shaw.ca> wrote: > I have a real world example question that I'm hoping to gain a better > insight/clarification to the Codec selection process on h323 dialpeers and > CUCM regions. > > > > Scenario: An h323 trunk between a CUCM cluster and a CME/CUE ISR. Typical > scenario of utilizing g729 over the WAN, but of course CUE can only use > g711. Currently, a transcoder on the CME is allowing this to work properly. > > > > Question: Is there any way to configure this in such a way that when two IP > phones connect, g729 is established, but if the CME phone forwards the call > to the CUE Pilot, the CUCM Phone will establish g711 to the CUE eliminating > the need for a transcoder? > > > > Comments/Questions are appreciated! > > > > Thanks, > Ryan > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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