I have a client with a CUCM 4.2 using two separate 2811 as MGCP gateways, each with a PRI T1 for inbound/outbound calls.
We're having a problem with seemingly random inbound calls that will have one way audio. The receptionist will answer an inbound call and she will be able to hear the caller but the caller will not be able to hear her. The caller will hang up and call back and this time everything works fine. The inbound calls this happens to have been long distance (from a different area code) but other than that they're pretty ramdom. Over eight different area codes.
Also, this may be a separate isssue, but randomly an outbound call will drop once the called party answers. Calling back will be successful.
This site is pretty static and no changes have been made to the gateways for months (if not years) prior to this problem starting.
We have our telco looking into things on their end but I wanted to see if anyone here has any thoughts as to what I can check.
Thanks in advance!