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New Member

Help with voice quality issue

Hi

I have a customer with a voice quality issue that I'm having a hard time fixing. The complaints are only coming from two (very important) people who happen to make a lot of long distance calls. They say that call placed to a handful of area codes (3 or 4 have been identified) contain static and noticeable delay much like a poor cell phone call (I'm assured the destination is not a cell phone).

The issue seems to only affect the IP phone user.

I haven't been able to monitor the gateway while one of these calls is occurring but whenever I get a complaint I've checked the CMRs and the latency, jitter, drops are all 0 and the codec is G711.

I don't think the calls are using dial-peer 0 but I don't know of any way to confirm that without monitoring the gateway during the call. I've pasted a portion of the config from their 2651xm PRI gateway below.

My other thought is that the echo cancellation might be responsible. Is that possible? I'm using the enhanced echo cancellation and have it set to 64ms.

The load on the gateway is 12.3(4)T. Call Manager is 3.3.3sr2

network-clock-participate wic 0

network-clock-select 1 T1 0/0

voice-card 0

dspfarm

no local-bypass

!

aaa new-model

!

!

aaa authentication login default line

aaa session-id common

ip subnet-zero

!

!

!

!

no ip domain lookup

ip domain name xxx.com

no ftp-server write-enable

isdn switch-type primary-5ess

!

!

!

!

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g729r8

!

!

!

voice class h323 1

h225 timeout tcp establish 3

!

!

!

!

!

!

!

!

!

controller T1 0/0

framing esf

crc-threshold 320

linecode b8zs

pri-group timeslots 1-24

!

!

!

interface FastEthernet0/0

ip address x.x.x.2 255.255.255.0

duplex auto

speed auto

h323-gateway voip bind srcaddr x.x.x.2

!

interface Serial0/0:23

no ip address

no logging event link-status

isdn switch-type primary-5ess

isdn incoming-voice voice

isdn bchan-number-order ascending

no cdp enable

!

interface FastEthernet0/1

duplex auto

speed auto

!

ip classless

ip route 0.0.0.0 0.0.0.0 x.x.x.1

ip http server

!

!

logging trap debugging

logging x.x.x.45

snmp-server enable traps tty

!

!

control-plane

!

!

!

voice-port 0/0:23

no vad

no comfort-noise

timeouts interdigit 3

!

!

!

!

!

dial-peer voice 1 voip

answer-address xxx.......

destination-pattern ....

progress_ind setup enable 3

voice-class codec 1

voice-class h323 1

session target ipv4:x.x.x.42

dtmf-relay h245-alphanumeric

no vad

!

dial-peer voice 2 voip

preference 1

answer-address 3...

destination-pattern ....

progress_ind setup enable 3

translate-outgoing calling 1

voice-class codec 1

voice-class h323 1

session target ipv4:x.x.x.41

dtmf-relay h245-alphanumeric

clid network-number 4144761880

no vad

!

dial-peer voice 3 pots

destination-pattern .......

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

incoming called-number .T

direct-inward-dial

port 0/0:23

forward-digits all

!

Thanks and sorry about the long post.

2 REPLIES
New Member

Re: Help with voice quality issue

I had the same exact issue at two of our sites. However we are using Call Mgr Express, not Call Manager, so I do not know if the issue is the same. I was advised to update the .bin file for the phone load to the newest one, and had to upgrade the Call Manager express software for a new DSP. It worked great. Is there a newer version of phone load or software you could upgrade to?

Bronze

Re: Help with voice quality issue

I would upgrade to sr4 or sr4a and the new phone load. May as well do it all at once.

Geoff

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