H.323 Outbound FastStart. Software MTP and codecs

[tikhonovoleg]

Hello guys,

Now, this is a kinda lame question which bugs me. It is said that whenever we seek h.323 outbound faststart an mtp resource must be injected in the call.

Imagine that we only have CUCM-based MTP which is only capable of 711 codec, in such case we'd be limited to said codec for all outbound h.323 calls with faststart enabled.

The question here is why CUCM MTP can not allow other codecs? I mean, it has all the info about calling device (e.g. it's a sccp cisco ip phone) and its capabilities, it also has knowledge of regions/locations so it is possible to shortlist desired codecs even further.

Cheers

[Chris Deren]

First of all why do you need to use fast start?

MTP is codec specific, but you can define multiple software MTPs with different codecs on your GW.

Chris

[tikhonovoleg]

My question is more theoretical than practical. So, lets assume that IOS MTP is not an option for the sake of discussion.

[Chris Deren]

In order to use fast start you need MTP, I don't think cucm can provide non G729 MTP resource, so your option would be ios MTP.

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