vMCD vMBG SIP Trunk - Force G.711u G711u

[bribob]

With reference to thread1329-1729559

vMCD 12.0.3.15
vMBG 8.0.12.0 (MSL 10.0.37.0) (proxy)

I'm looking for a way to send ONLY G711u in the INVITE going to a SIP peer. The SIP provider is unwilling to suppot G729 or G711a on their SBC, so I am being encouraged to find a Mitel based solution to present a single codec.

Having the endpoints/proxy/peer in the same zone as the referenced post suggests is not an option due to CESID and CPN being assigned using that method. G729 is utilized throughout the cluster (inter/intra-site,NuPoint,MCA)

Has anyone found a method, whether it is a parameter within the vMBG/vMCD or a 3rd party device for converting G729 to G711?


-b

 

[jpruder]

You might check with Adtran to see if a 908e will do what you want.

 

[Billz66]

latest MCD version ( 7.0 ) allows you to restrict codec used on sip peer

Restrict Audio Codec


This option controls which codec/s can be negotiated over SIP trunks. Calls that use any other codec will be rejected. The recommended setting is 'No Restriction' (default), which means any codec is allowed and none removed.

Options are G.729 , G.711u , G.711a,G.711u/G.711a G.711u/G.711a/G.729

If I never did anything I'd never done before , I'd never do anything.....

 

[bribob]

Thanks Billz,

Looks like I have another reason to upgrade the cluster.

Interestingly enough, I've disabled Force Sending SDP in initial Invite Message for the Peer and made an outbound call over the trunk. The SDP portion of their 200 OK response to my INVITE contains G729 and PCMU (G711u). Looks like their SBC is willing to support G729 even though their policy is to not support it.


-b

 

[AlphaMann]

According to Mitel you can also put devices in different zones and it should force g711 between them.

 

[bribob]

Alpha,

I think you may have the codec mixed up. Devices in different zones will opt for G729, devices within the same zone would opt for G711. Turn on intra-zone compression and devices in the same zone will go with G729 as well.

As Billz pointed out this is a feature in MCD 7 so unless my provider is willing to enforce their own policy, they're going to have to wait for me to upgrade.


-b

 

[bribob]

Not trying to sound confrontational.

I did put the vmcd and sip peer in the same zone and disabled intrazone compression, as suggested in the original post. G729 was still elected as the codec.
Granted, I did not capture the SDP exchange for that call so I don't know the order in which the media attributes were listed (if that even matters).


-b

 

[AlphaMann]

Good call on the codec.