I am having alot of trouble userstanding why one would choose one voice control protocol over another. I understand that MGCP is master/slave and gets almosta ll of its config via callmanager, doesn't support SRST without fallback to an H.323 endpoint and such. I know that H.323 has alot more IOS config to do, dial-peers, etc., but other than that what is the difference?
Is there a feature comparison somewhere or why do you guys choose one over the other?
I don't know why i am having such a hard time understanding all this. I looked at your link and have done quite a bit of research on the different protocols this evening.
What i am having trouble understanding is more of the conceptual ideas behind these protocols. Take h323 for instance. Its media independent, so it doesn't matter what type pstn circuit your pipe into the gateway because it terminates all of that low layer info matches dial-peers and only passes relevant info to callmanager which leads me to the big point:
What the heck does callmanager do in an h323 environment? I mean if the gateway is that smart and can do everything, and an h323 endpoint cal call another endpoint directly, how does callmanager factor in? How is your dial plan administered via CM when you have dial-peers on an h323 gateway?
I'd like to add my opinion here. H323 is more clever than MGCP. When CCM passes the call to H323, it steps out of the picture and let H323 does its job. Whereas MGCP is a dump one, CCM have to be in the picture till users hang up the call. I picked up MGCP because my customer wants CDR to keep track of the call (MGCP backhaul feature). H323 does not relay isdn signalling to CCM so CCM knows nothing about the call duration.
Actually I prefer H323 because of my familiarity with its debug output compare to the MGCP's.
While an H.323 gateway does have the dial plan information it needs, Callmanager sitll plays a role. H.225 (Call setup and control) and H.245 (Capabilities exchange and logical channel negotiations) messages are exchanged between the gateway and callmanager. Once the call is established, the RTP stream goes between the 2 endpoints without passing through callmanager.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...