RE: VOIP FXS Gateways that support SIP

["Ian Willoughby" <ian@xxxxxxx>]

Hi All,

OK so if I understand this all correctly SIP vs H.323 is how the call gets
made. Both SIP & H.323 the actually do the transfer of the Voice
content via RTP and compress using the various codec's available.

So the things that are going to effect quality are : -


*	Differences in Codec's ability to compress and decompress acurately and
efficiently.
*	Bandwidth available and how well it is used, less being better.

To be fair to Solwise, they are only quoting their customers experiences, I
have asked for a relative benchmark on their Pheenet gateways between H.323
and SIP communication, From what has been said, they should be identical.

I am going to assume that the SIP is CR*P means bugs in firmware/software
between devices (more than likely Microsoft bugs in Messanger) and that if
I buy kit now that these will be rectified. SWMBO may also have to live
without a new Bathroom ;-)



R's

Ian



-----Original Message-----
From: UKHA [mailto:ukha@xxxxxxx]
Sent: Fri 02/05/2003 11:19
To: ukha_d@xxxxxxx
Cc:
Subject: Re: [ukha_d] VOIP FXS Gateways that support SIP




>Hi Ian,
>
>> Surely SIP is also the transport protocol as well as Signalling or
am I
>missing something :-)
>RTP is used for transport.. SIP is used only for signaling (as I
know)..
>Some other opinions here?
>
>Dan


Dan,

you are correct, SIP stands for "Session Initiation Protocol",
it's used
for signaling - the clue being in it's name ;) , not rtp streams.

Andy