I got a MGCP gateway w/ SRST and a T1 PRI trunk for PSTN calls. When I lost the WAN, SRST worked but I faced 2 issues:
1. Active calls didn't survive, and
2. I couldn't make outbound calls
I think I have some workarounds for the 2nd issue. However, the 1st issue is what I really wanted to get to the bottom of it. I know if I lose all callmanagers, PRI will get backhauled to the SRST router, then D-channel gets reset and my call will be dropped. Is there a way to fix this problem? I want to keep MGCP if possible.