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Options 17800 Views 0 Helpful 8 Replies

G.711 vs G.729

lwmoseley lwmoseley Level 1 Level 1 Options

‎01-10-2013 09:56 AM - edited ‎03-16-2019 03:06 PM

On my 2901 router, the config on my dial-peer voice for VOIP is set to use voice-class codec 1 which is defined in the router as G.729. However, within the call manager, the Region Audio Codec is set to G.711.

Which one is it using? Which takes precedence? Should the codecs match? Which codec is better for voice?

Thanks in advance

I have this problem too Labels:
  • Other IP Telephony
  • callmanager
  • codec
  • dial-peer
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8 Replies 8 Aaron Harrison VIP Alumni Aaron Harrison VIP Alumni Options

‎01-10-2013 10:35 AM

Hi

A regions config of G711 actually means 'use up to 64kbps of bandwidth per call'. That's why it can use G722 or G711 as it sees fit.

In this case, G729 (8K)is less than G711 (64k) and is the only codec your CME is going to claim to support, so it should use that.

You can hit ? twice in quick succesion on the phone to see what codec is in use on the current cal.

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate! 0 Helpful Reply lwmoseley lwmoseley Level 1 Level 1 In response to Aaron Harrison Options

‎01-10-2013 10:40 AM

So it is irrelevant the setting that the router is set to use becuase the CME is going to dictate which codec? I just did a test call and it was using G.711. I am questioning this because we are having some call quality/jitter issues and I wonder if I sould set the CME to G729 for all regions so it won't use as much bandwidth.

0 Helpful Reply Aaron Harrison VIP Alumni Aaron Harrison VIP Alumni In response to lwmoseley Options

‎01-10-2013 10:43 AM

Hi

Did you call CUCM-->CME, or CME-->CUCM?

Can you post up your dial-peer config, called/calling number, and a debug voip dialpeer taken when you make the call?

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate! 0 Helpful Reply lwmoseley lwmoseley Level 1 Level 1 In response to Aaron Harrison Options

‎01-10-2013 10:54 AM

Sorry, I am running CUCM v7.0.

the sending and receiving codec has been confirmed as G.711. Just tested. Still curious as to whether or not I should change over to G.729 in order to conserve bandwidth on the regions. Seems no matter what the router codec preference is set to the CUCM is going to use what is defined to that region.

0 Helpful Reply Aaron Harrison VIP Alumni Aaron Harrison VIP Alumni In response to lwmoseley Options

‎01-10-2013 10:57 AM

Well- you can guess, or you can troubleshoot.

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate! 0 Helpful Reply lwmoseley lwmoseley Level 1 Level 1 In response to Aaron Harrison Options

‎01-10-2013 11:24 AM

With all due respect, I am not guessing. I saw the output on my handset. Here is some of what you requested. I am spacing on how to view the output of the debug...

voice class codec 1

codec preference 1 g729r8

codec preference 2 g711ulaw

codec preference 3 g723r63

codec preference 4 g723r53

dial-peer voice 5701 voip

description Jackson PLAR number

preference 1

destination-pattern 5796

progress_ind setup enable 3

session target ipv4:172.18.2.10

voice-class codec 1

dtmf-relay h245-alphanumberic

no vad

0 Helpful Reply Ayodeji Okanlawon VIP Alumni Ayodeji Okanlawon VIP Alumni In response to lwmoseley Options

‎01-10-2013 11:28 AM

Hi,

In this scenario...

for inbound calls to CUCM, CCME is going to advertise TCS with G729, G711,G723...

CUCM is going to send back its own TCS with only G711 because the region setting is set to use only G711....Hence G711 will be used.

To see the actual media negotitation,

debug h225 asn1

debug h245 asn1

Please rate all useful posts

"'Nature is too thin a screen, the glory of the omnipresent God bursts through it everywhere"-Ralph Waldo Emerson

Please rate all useful posts 0 Helpful Reply Chris Deren Hall of Fame Chris Deren Hall of Fame In response to Ayodeji Okanlawon Options

‎01-10-2013 01:21 PM

Just to add to some great points here from my colleagues, the behavior is different in CUCM 9.X and on vs. previous versions, as Aaron described the region config up until version 9 defines the max codec rate, so if G711 is specified in the region it does not mean G711 will be used but rather that up to G711 can be used. With version 9.X "Audio codec preferecnce" list has been added where you can define a list of preferred codecs similar to codec-class on the router.

HTH,

Chris

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