Choppy call over pstn

cnorton · ‎10-11-2012

HI Guys, Can i ask your help about our phone issues. All calls are getting choppy at some point during conversation. This happens on all offnet call. I did show call active voice brief and saw jitter and latency. I already check network and found no trouble at all. Can anyone tell me what possible cause of this and how can i rectofy it? Thanks in advance!

183C : 3258 16:28:16.403 GMT Thu Oct 11 2012.1 +0 pid:0 Originate connecting
dur 00:01:44 tx:5224/835840 rx:5223/835680
IP 10.118.244.141:25266 SRTP: off rtt:0ms pl:95880/740ms lost:2/0/27 delay:75/55/465ms g711ulaw TextRelay: off
media inactive detected:n media contrl rcvd:n/a timestamp:n/a
long duration call detected:n long duration call duration:n/a timestamp:n/a

paolo bevilacqua · ‎10-11-2012

When quality suffers, press ? twice on phone, look at packet loss statistic.

If any packet loss shows, then it's network fault.

Dennis Mink · ‎10-11-2012

Where are your phone in relation to your Gateway? does your RTP go across the WAN for Off Net calls?

Have you checked QoS and it policy usage?

when you say you checked the network, what exactly did you check?

Please remember to rate useful posts, by clicking on the stars below.

cnorton · ‎10-12-2012

These aere all offnet. Items Here are what i checked on the network side

-no overutilization on the lan interfaces

-qos are applied on all trunks and access ports

-no packet drops on my ping test from router to access switches

-these all goes to PSTN line so no need for policy map on the wan link

-telco also said that there is no issue on their end for the pri circuits

vschallenberg · ‎10-12-2012

Have you run the "show controller t1" and "show interface serial" commands on the PRI? This may give some useful information.

cnorton · ‎10-12-2012

Here are the stats of the controllers and serial interfaces. All of them are clean

T1 0/1/0 is up.

Applique type is Channelized T1

Cablelength is long 0db

No alarms detected.

alarm-trigger is not set

Soaking time: 3, Clearance time: 10

AIS State:Clear LOS State:Clear LOF State:Clear

Version info Firmware: 20100222, FPGA: 13, spm_count = 0

Framing is ESF, Line Code is B8ZS, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (367 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

T1 0/1/1 is up.

Applique type is Channelized T1

Cablelength is long 0db

No alarms detected.

alarm-trigger is not set

Soaking time: 3, Clearance time: 10

AIS State:Clear LOS State:Clear LOF State:Clear

Version info Firmware: 20100222, FPGA: 13, spm_count = 0

Framing is ESF, Line Code is B8ZS, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (367 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

7732-1-1-RTR01# show int ser0/1/0:23

Serial0/1/0:23 is up, line protocol is up (spoofing)

Hardware is DSX1

Description: Level 3 PRI

MTU 1500 bytes, BW 64 Kbit/sec, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:07, output 00:00:07, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 48 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

49045 packets input, 292140 bytes, 0 no buffer

Received 0 broadcasts (0 IP multicasts)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

38208 packets output, 232287 bytes, 0 underruns

0 output errors, 0 collisions, 4 interface resets

0 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

5 carrier transitions

Timeslot(s) Used:24, SCC: 0, Transmitter delay is 0 flags

7732-1-1-RTR01#show int ser0/1/1:23

Serial0/1/1:23 is up, line protocol is up (spoofing)

Hardware is DSX1

Description: Level 3 PRI

MTU 1500 bytes, BW 64 Kbit/sec, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:16, output 00:00:16, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 48 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

31059 packets input, 141671 bytes, 0 no buffer

Received 0 broadcasts (0 IP multicasts)

0 runts, 0 giants, 0 throttles

1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort

31122 packets output, 169201 bytes, 0 underruns

0 output errors, 0 collisions, 4 interface resets

0 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

3 carrier transitions

Timeslot(s) Used:24, SCC: 1, Transmitter delay is 0 flags