I have come accross a CallManager w/MGCP configured 4-Port FXO gateway. One of the ports is configured for Loopstart, the remaining are groundstart. Carrier is providing loopstart signalling, yet all 4 lines are working.

FXO on the IOS gateway are all set to default (loopstart). Here's a rough sketch:

4-Port FXO. In IOS all ports are default as loop, but on MGCP 3 are GS

0/0/0 FXO-LS - MGCP G/W Configured as Loopstart (for testing) - Telco handing off Loopstart - Calls are completing

0/0/1 FXO-LS - MGCP G/W Configured as Groundstart - Telco handing off Loopstart - Calls are completing

0/0/2 FXO-LS - MGCP G/W Configured as Groundstart - Telco handing off Loopstart - Calls are completing

0/0/3 FXO-LS - MGCP G/W Configured as Groundstart - Telco handing off Loopstart - Calls are completing

I was under the impressing that MGCP on CCM would be controlling the signalling? yes?

edit: confusing post :)