Re: dspfarm can impact on call transferring issue?
DSP resources (DSPFarm) can come into play when transferring calls (example from g.711 to g.729) Have a look;
Transcoding Support Overview
Versions of Cisco Unified CME earlier than Cisco CME 3.2 supported G.729 compressed voice calls for two-party calls only. Cisco CME 3.2 and later versions support transcoding between G.711 and G.729 for the following features:
Ad hoc conferencing One or more remote conferencing parties uses G.729.
Call transfer and forward One leg of a Voice over IP (VoIP)-to-VoIP hairpin call uses G.711 and the other leg uses G.729. A hairpin call is an incoming call that is transferred or forwarded over the same interface from which it arrived.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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