Have you resolved this issue? If not I would suggest looking into the router configuration. In addition to the voice-port configuration, you will also need a corosponding "dial-peer". I have seen situations when incomplete dial-peers are in the config ahead of the correctly configured dial-peer. When that happened I got the same symptoms -- one ring and then dial-tone.
Just to add a note to Paolo's good info. The first thing to do is to isolate the Line from the equipment. Connect an Analog phone to the Line before it attaches to the equipment and see if the problem still exists. If yes/ then contact Telco provider (may be a problem often referred to a Ring-Trip), if No/ reconnect the Line and continue troubleshooting.
Yes, that is a reasonable description. Here is another one (along with some other good info);
The Cisco Foreign Exchange Office (FXO) interface is an RJ-11 connector that allows an analog connection to be directed at the public switched telephone network's (PSTN's) central office or to a station interface on a private branch exchange (PBX). The FXO sits on the switch end of the connection. It plugs directly into the line side of the switch so the switch thinks the FXO interface is a telephone.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...