Mono-directional voice from PSTN and with internal calls

[willsupport]

Hi,

i have an issue with my CUCM+VG.

Sometimes, when a call is active, the voice is missing. This happen with external calls and with internal calls.

On the controller e1 interfaces i have some errors, that i attach below:

gwvoice#show controller e1 0/1/0 brief
E1 0/1/0 is up.
Applique type is Channelized E1 - balanced
Description: === PRI 1 ===
No alarms detected.
alarm-trigger is not set
Framing is crc4, Line Code is HDB3, Clock Source is Line.
International Bit: 1, National Bits: 11111
Data in current interval (760 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
49 Slip Secs, 49 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
98 Errored Secs, 0 Bursty Err Secs, 49 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
5967 Slip Secs, 6004 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
11968 Errored Secs, 0 Bursty Err Secs, 6001 Severely Err Secs, 4 Unavail Secs
gwvoice#

gwvoice#show controller e1 0/2/0 brief
E1 0/2/0 is up.
Applique type is Channelized E1 - balanced
Description: === PRI 2 ===
No alarms detected.
alarm-trigger is not set
Framing is crc4, Line Code is HDB3, Clock Source is Line.
International Bit: 1, National Bits: 11111
Data in current interval (876 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
57 Slip Secs, 57 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
114 Errored Secs, 0 Bursty Err Secs, 57 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 49 Path Code Violations,
5962 Slip Secs, 6405 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
12278 Errored Secs, 0 Bursty Err Secs, 6336 Severely Err Secs, 74 Unavail Secs
gwvoice#

Can someone help me?

Thanks,

Alessandro

[Mohammed al Baqari]

Voice missing is equivalent to packet loss. What is the deployment? CCM or
CME? Is the phone and VG separated by WAN or same LAN?

[willsupport]

Hi,

thanks for your reply.

The IP phones, VG and CUCM are in the same LAN.

[Georgios Fotiadis]

Can you share some details on the "the voice is missing" part? Do you experience choppy audio? Does it happen that audio comes and goes on the same call?

[willsupport]

Hi,
thanks for reply.
Sometimes i have monodirectional calls, the calling can't hear the voice of the called and the other way around.
Sometimes, the audio comes and goes.

This happen with internal calls and external calls.

[Georgios Fotiadis]

The first thing, as also noted by @Mohammed al Baqari, is to check you do not have network issues in your LAN; high delay, packet loss etc. Next thing, would be look into your CUCM's resource utilization (CPU, memory), through RTMT.

Can you pinpoint if you face the same issues when your server is off-loaded; eg. outside business hours?

[willsupport]

No issues in LAN, the utilization of the resources is good.
Outside business hours there's no one in office.

We have two PRI lines with 30 channels each one.
Even if i do a single call i could experience the issue.

[Georgios Fotiadis]

That is quite strange.. You could enable the Span to PC Port option at device configuration and attach a workstation on the PC port with a packet sniffer running. See if you send/receive RTP packets when silence occurs.

[willsupport]

Hi,

the problem was the preferences on the dial peer for the imcoming calls, they were missing.

After configuration of them, the user had no more problems