Re: Default Codec on 7912G

moorep6cco · ‎09-22-2006

Running Callmanager Express 3.3 on 2800 hardware. When calling between sites, using 7960 handsets, quality of call is perfect, using 7912G to 7960, very poor quality. I have read that the 7912G defaults to G.711 codec unless you enable g.729. Can anyone confirm this, and if thats right, how do you change it (profile ? webpage ?)

Thanks

tbramwe · ‎09-22-2006

All devices in your CME group should use the same codec as set in the DSPfarm. 7912, 7940, 7960, etc.. should not vary unless they are in a different CME group.

The command should be

Router(config-dspfarm-profile)# codec g711ulaw

I believe this to be true in 3.3, as the doc indicates transcoding for g.729 was only between two-party calls in 3.2 and prior.

http://www.cisco.com/en/US/customer/products/sw/voicesw/ps4625/products_configuration_guide_chapter09186a00804ad867.html

Hope that helps.

Tom

moorep6cco · ‎09-25-2006

Sorry, perhaps I didnt make it very clear. The problems are between 2 CME system, over a wide area link. I assumed that selecting the codec in the dial-peer statement was enough to ensure that g729 was used, but I dont think it is - hence the quality problems.

Anything anyone can add to that ?

tbramwe · ‎09-25-2006

Did you configure the router in global mode to use 729 also?

Try this:

Router#conf term

Router(config)#voice class codec 99

Router(config-class)#codec preference 1 g729r8

Router(config-class)#codec preference 2 g711ulaw

Router(config-class)#end

Then assign 729 to the dial-peer as well.

See if that helps.

moorep6cco · ‎09-26-2006

Thanks, I will apply and test. Do you know any way of checking the codec used in an active call ? (sorry if thats a stupid question)

Pete

tbramwe · ‎09-26-2006

Pete:

Use 'sho call active voice' on the router from privileged mode.

... and I was told by a very wise man once that the only stupid question is the one that doesn't get asked.

Tom

moorep6cco · ‎09-26-2006

Oh :( that blows that idea then; looks like we are using 729r8, so thats not my problem. Still cant understand why calls between 7960's are working but calls to 7912's are jittering.

output from show command:

Router# sho call active voice

Telephony call-legs: 1

SIP call-legs: 0

H323 call-legs: 1

Call agent controlled call-legs: 0

SCCP call-legs: 0

Multicast call-legs: 0

Total call-legs: 2

GENERIC:

SetupTime=1868195990 ms

Index=1

PeerAddress=771

PeerSubAddress=

PeerId=20001

PeerIfIndex=39

LogicalIfIndex=38

ConnectTime=1868200590 ms

CallDuration=00:00:46 sec

CallState=4

CallOrigin=2

ChargedUnits=0

InfoType=speech

TransmitPackets=0

TransmitBytes=0

ReceivePackets=1150

ReceiveBytes=46000

TELE:

ConnectionId=[0x58CEC485 0x4CA311DB 0x833B8EBE 0x6294392]

IncomingConnectionId=[0x58CEC485 0x4CA311DB 0x833B8EBE 0x6294392]

CallID=516

TxDuration=39320 ms

VoiceTxDuration=39320 ms

FaxTxDuration=0 ms

CoderTypeRate=g729r8

NoiseLevel=0

ACOMLevel=0

OutSignalLevel=0

InSignalLevel=0

InfoActivity=2

ERLLevel=0

SessionTarget=

ImgPages=0

CallerName=Pete Moore

CallerIDBlocked=False

OriginalCallingNumber=771

OriginalCallingOctet=0x0

OriginalCalledNumber=

OriginalCalledOctet=0x80

OriginalRedirectCalledNumber=

OriginalRedirectCalledOctet=0x0

TranslatedCallingNumber=771

TranslatedCallingOctet=0x0

TranslatedCalledNumber=

TranslatedCalledOctet=0x80

TranslatedRedirectCalledNumber=

TranslatedRedirectCalledOctet=0x0

GwCollectedCalledNumber=100108

GwReceivedCallingNumber=771

GwReceivedCallingOctet3=0x0

GwReceivedCallingOctet3a=0x0

Telephony call-legs: 1

SIP call-legs: 0

H323 call-legs: 0

Call agent controlled call-legs: 0

SCCP call-legs: 0

Multicast call-legs: 0

Total call-legs: 1

The number of call legs at the end of the show process

is not equal to the initial count. Some call-legs were

terminated or created during the viewing process.

Number of call-legs counted during viewing: 1

tbramwe · ‎09-26-2006

Pete:

This may seem strange to ask, but we ran into it once. Are your user's network ports nailed-up to a specific speed and duplex?

The 7912G is not able to be hard set to a speed or duplex - auto is the only option. The 7940/60G is able to be set and, as a result, reduced the duplex mismatches we were getting in our environment. Call quality improved, too.

Just a thought.

Tom