[SIPForum-techwg] Media line Transparency

[Horvath, Ernst]

Shaun,


> -----Original Message-----
> From: techwg-bounces at sipforum.org 
> [mailto:techwg-bounces at sipforum.org] On Behalf Of Bharrat, Shaun
> Sent: Wednesday, February 11, 2009 2:56 PM
> To: Theo Zourzouvillys
> Cc: techwg at sipforum.org
> Subject: Re: [SIPForum-techwg] Media line Transparency
> 
> Theo:
> 
> 
> > In which case, the call would be terminating on an UA inside 
> > the SP-SSEs network (i.e, a PSTN gateway) - the above text, 
> > *end to end* transparency, is relevant to SP-SSE SIP elements 
> > between the UAC and the UAS.
> 
> I'm not sure what you are getting at. I would think that if phone A
> on a PBX in enterprise A calls phone B on a PBX in enterprise B,
> then the media would (or certainly could) traverse the SP-SSE
> network. The SP-SSE cannot be obliged to allow an unqualified
> media path through its network.

Transparency is only intended for connections from one PBX user to
another PBX user. Why should that be prohibited as long as bandwidth
limits are obeyed and the PBX owner pays for the transport as such, if
the media passes through the SP network at all - it may well go directly
end-to-end, in which case only transparency for the SDP body would be
required. Transparency can be settled by a service level agreement
between enterprise and SP.

Regards,
Ernst Horvath

> 
> I'm probably just completely misunderstanding your point.
> 
> Cheers,
> Shaun
> 
> > -----Original Message-----
> > From: Theo Zourzouvillys [mailto:theo at crazygreek.co.uk] 
> > Sent: Wednesday, February 11, 2009 6:54 AM
> > To: Bharrat, Shaun
> > Cc: techwg at sipforum.org
> > Subject: Re: [SIPForum-techwg] Media line Transparency
> > 
> > On Wed, Feb 11, 2009 at 3:40 AM, Bharrat, Shaun 
> > <SBharrat at sonusnet.com> wrote:
> > > I missed this in Section 6.1 before...
> > >
> > > SP-SSEs
> > > 1. MUST accommodate unsupported (and unrecognized) media types by 
> > > passing SDP media lines and attributes unchanged, and
> > >
> > > Am I misreading this or is this saying that an SP-SSE 
> > effectively is 
> > > barred from mediating or policing the media should the 
> > SIP-PBX provide 
> > > an unknown codec? I cannot understand how this can be a 
> MUST. If an 
> > > enterprise pays for G711, the SP-SSE should not be 
> > obligated to accept 
> > > anything else, whether or not it understands the other 
> media lines 
> > > and/or codecs.
> > >
> > > Can someone elaborate.
> > 
> > In which case, the call would be terminating on an UA inside 
> > the SP-SSEs network (i.e, a PSTN gateway) - the above text, 
> > *end to end* transparency, is relevant to SP-SSE SIP elements 
> > between the UAC and the UAS.
> > 
> > 
> >  ~ Theo
> > 
> > --
> > Theo Zourzouvillys
> > Chief Technical Officer
> > VoIP.co.uk - Commerce House, Telford Road, Bicester, OX26 4LD
> > Tel: +44 1908 764 196
> > 
> 
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