I've configured MGCP on a 2801 with a VIC2-2FXO card and configured the gateway on CCM. It registers and all looks good. I can call fine between my IP phones but when I try to call out to the PSTN through the FXO port I end up with one way audio.
Specifically I can hear the audio from the PSTN phone but they can not hear me.
I tried running "debug mgcp packets" and noticed that during call setup I see the following...
000203: May 28 12:11:33.703: MGCP Packet received from 10.20.4.52:2427--->
CRCX 18 AALN/S0/SU2/[email protected] MGCP 0.1
L: p:20, a:PCMU, s:off, t:b8
R: H/oc, H/of, L/hd
The item which concerns me is the "Connection Mode" paramater ser to "Read Only" which apparently means the the connection is being put in a one-way audio state of recieve only. Can anyone tell me why this might be and what I need to do to get normal two way audio?
Thanks for any assistance.