Re: Role of MGW in SIP to SIP calls

 IMS core is my main concern where MGW is mainly for VCC and CS interoperability. For SIP-SIP which is pure IP , will MGW have statistics [will it even go through MGW] , this  is my question in particular ? 

How will  IP qos which is realized through intserv, diffserv etc.. relate to these parameters in MGW [Mos, delay , Jitter]. 

I think answer to my first question wil help for this part because if SIP-SIP always goes through MGW in IMS for various other goodies MGW has to offer [echo cancellation, any transcoding etc.. and repacketization anyways] then I have already found answers already to my second one. IP diffserv helps in prioritization and MGW helps in dealing with actual voice coding details.

Thanks in Advance for your help. Am new to both areas and trying to relate them. I dont find this ifo explicitly anywhere.

Best regards
Priya Krishnan

--- On Wed, 7/14/10, Schwarz, Albrecht (Albrecht) <[email protected]> wrote:

> From: Schwarz, Albrecht (Albrecht) <[email protected]>
> Subject: RE: [Megaco] Role of MGW in SIP to SIP calls
> To: "Priya Krishnan" <[email protected]>, "[email protected]" <[email protected]>
> Date: Wednesday, July 14, 2010, 4:52 AM
> Your assumption is incorrect: there
> are many H.248 IP-to-IP MG types defined, e.g. ETSI TISPAN,
> 3GPP, MSF or ITU-T SG11.
> Such MGs may be located between two SIP devices in the IP
> bearer-path.
> A number of H.248 statistics are defined e.g. by ETSI TS
> 183 018, the H.248 Ia profile V3 for border gateways.
>  
> 
> > -----Original Message-----
> > From: [email protected]
> 
> > [mailto:[email protected]]
> On Behalf Of Priya Krishnan
> > Sent: Mittwoch, 14. Juli 2010 13:44
> > To: [email protected]
> > Subject: [Megaco] Role of MGW in SIP to SIP calls
> > 
> > Hi All,
> > 
> > For a call between 2 SIP users [capable of packetizing
> voice 
> > info]  ,typically there is no role played by MGW
> actually ? 
> > Is this assumption right or is there a role for
> MGW.  Under 
> > such circumstances how do we obtain QoS statistics
> which 
> > could be taken care by intserv, diffserv
> technologies.
> > 
> > Thanks in advance
> > Priya
> > 
> > 
> > 
> >       
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