External Calls get dead air when answered.

[gavinr98]

Needs some help, we recently had a router go down and after it was replaced, we have been having some strange issues with some users having issues when calling external or receiving external calls. We can call the DID, it will ring and when they answer, neither side can hear anything. The same goes for when they are calling external. If they make internal calls, everything is fine. This is not happening will all the users, only some and we cannot seem to figure out what is causing this. Does anyone have any suggestions on how to troubleshoot this?

[Nithin Eluvathingal]

is it a PRI, can you share the show controller E1 or T1. 

[gavinr98]

Yes, its a PRI, here is the output

sh controllers t1
T1 0/2/0 is up
Applique type is Channelized T1
Cablelength is long gain36 0db
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
BER thresholds: SF = 10e-3 SD = 10e-6
Data in current interval (684 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
50 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
50 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 90 15 minute intervals):
5 Line Code Violations, 4 Path Code Violations,
5979 Slip Secs, 0 Fr Loss Secs, 3 Line Err Secs, 0 Degraded Mins,
5980 Errored Secs, 2 Bursty Err Secs, 0 Severely Err Secs, 2 Unavail Secs
T1 0/2/1 is administratively down

[Nithin Eluvathingal]

There is so many slips and line code violations. 

enter clear counters and see if its incrementing. if incrementing  contact ISP. 

network clock and participate command , have you configured this on gateway ?

[Vaijanath Sonvane]

Hi,

Is this issue happening for local or remote users?  What connection type (SIP / PRI / FXO) you are using to PSTN? Are you able to ping the affected users from router?

[gavinr98]

These are local users, we are using a PRI and yes using the PSTN. Yes, we can ping the device from the router.