I have a couple of questions. First, what is best practice on configuring H.323 gateway for call preservation? Assume a remote site with a PRI where the phones are registered back to CCM at HQ. I've seen 3 different configs and don't know when to use which:
voice service voip
no h225 timeout keepalive
voice service voip
voice class h323 1
h225 timeout tcp establish 3
The second question is regarding MGCP fallback. I know that when an MGCP gateway fallsback to H.323 during SRST that active PRI calls will drop because of the D-channel backhaul. However, when there are active calls in SRST and the router goes back to MGCP, will those calls drop while it re-establishes MGCP or is there a way to have call preservation for those calls since they were set up via H.323 gateway?
Re: H.323/MGCP Call Preservation - When to use what?
>voice class h323 1
> h225 timeout tcp establish 3
This command is for new calls only; it will change the timeout from the default of 15 seconds when hunting through the dial-peers. Since the timeout for ISDN is 10 seconds, you need the timeout to be less than that in order for new calls to be established when target of the primary dial-peer is unavailable. 2-5 seconds is the recommended setting
>voice service voip
> no h225 timeout keepalive
It's my understanding this is to preserve calls when going from a CallManager to an SRST gateway, but not from one CallManager to another.
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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