11-20-2009 07:29 AM - edited 03-15-2019 08:31 PM
Hello,
I have an MGCP gateway with 4 FXO. Only 2 FXO er connected to Telco lines.
One FXO/Line hehaves very normally. However, When I call the num asssociated to the second FXO the attendant internal IP phone keeps to ring one time then stops , then rings one time again , then ring one time ,.... continuously.
I can't see any prob in the config and the debug commands output
The caller hears a continuous (normal) ring.
Any suggestions to resolve this.
best regards,
11-24-2009 08:07 AM
If you disconnect the POTS line and connect it to a test phone set does it behave normally?
What if you switch it with the first FXO, same behavior?
04-22-2010 10:26 AM
How did you resolve this issue?
06-16-2010 07:46 PM
Same issue here, any resolution? I will post if I get this figured out.
Bill
06-16-2010 08:01 PM
If someone has an SDI trace (Detailed level) from UCM showing the MGCP and SCCP signaling of this; and/or an output from the router with the following debugs, it would help us narrow this down for you. Please include the gateway and IP phone addresses involved in the example.
debug voip ccapi inout
debug vpm signal
Also, is this a loop or ground start FXO circuit?
Lastly, I'm not positive that I follow the original description here. Please confirm whether this is accurate or not:
06-16-2010 08:08 PM
I will get the debugs and post tomorrow. I can confirm the experience. The caller hears normal ringing, the Called phone does a half ring then disconnects, and does this until the caller disconnects.
Bill
06-17-2010 05:23 AM
William,
Most likely it is a telco issue on the pots line, which was the issue for us
Swap the two FXO port lines, The problem will follow the pots line.
The verizon tech mentioned there was a crossed pair outside the facility.
Good Luck
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: