a query

Chris Wayman Purvis cwp at ISDN-COMMS.CO.UK
Thu Feb 22 06:05:39 EST 2001


Alok,

Call setup messages go over "a reliable protocol".  If you want to
interoperate with anyone else, this is likely to be TPKT/TCP/IP.  The
philosophy is that call setup needs to work (i.e. better a packet arrives
late than never), whereas audio & video data are time critical (i.e. late
packets are worse than dropped packets).

Why does call setup info require prioritisation?

Regards,
Chris


Alok Dubey (OCS-BLRAKS-AVS) wrote:

> hi
>
> im sorry for posing this query out here but i needed this answer asap..
>
> Im basically more of an implementor than a protocol developer and all my job
> is above the layer 3.. ie socket programming etc.
>
> Right now while going thru the specs, I could not find any reasonable
> explanation on how u prioritise traffic for call setup?
>
> for eg are u sending callsetup info over RTP ports too..? if yes, i still
> have to figure out how to use Voice Activity Detection to conserve bandwidth
> a feature which lets us drop voice packets below a certain db level .., if
> no this basically means that setting up a call could take a long time and
> the traffic associated with it cannot be controlled/prioritised..
>
> can anyone refer me to any good specs
>
> Sorry to be wasting ur time on such a query.. but i couldnt think of a
> better place to pose this question.
>
> Rgds
> Alok
>
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Dr Chris Purvis -- Development Manager
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