Jose,
By "realm" I meant that both UAs were in the public internet (both had
globally routable IP addresses) or they were both in the same private
network. If they are not, a SIP ALG proxy would likely be required to get
the SIP session through the NAT between the networks.
(-:bob
----- Original Message -----
From: "Jose Martinez" <[EMAIL PROTECTED]>
To: "Bob Penfield" <[EMAIL PROTECTED]>; "Varadarajan Srinivasan"
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, June 06, 2001 2:00 PM
Subject: Re: [SIP] Proxy - A basic question
> Why do they have to be in the same realm?
>
> --- Bob Penfield <[EMAIL PROTECTED]> wrote:
> >
> >
> > ----- Original Message -----
> > From: "Varadarajan Srinivasan"
> > <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Wednesday, June 06, 2001 8:08 PM
> > Subject: [SIP] Proxy - A basic question
> >
> >
> > > Hi,
> > >
> > > >From RFC, We are asked to look upon proxy as DNS
> > sort.
> > >
> > > Can I assume that UA "MUST" be tagged to a proxy?
> >
> > The SIP spec does not require that UA to use a
> > proxy.
> >
> > > That is all calls to UA outside its domain should
> > come via proxy?
> >
> > If a UAC knows or can determine the IP address of
> > the UAS and the UAC and
> > UAS are in the same "realm" (i.e. NAT and firewall
> > are not an issue), it
> > does not have to go thru a proxy.
> >
> > The presence of proxies in the network relieve UAs
> > from having to figure out
> > the IP Address of the other end by providing
> > location services. It can also
> > enable lots of other services.
> >
> > >
> > >
> > >
> > > Mr. Varadarajan Srinivasan,
> > > Senior Systems Engineer,
> > > Wipro Technologies.
> > >
> > >
> > >
> >
> >
> > _______________________________________________
> > This list is for continuing development of the SIP
> > protocol.
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> > implementation,
> > and to receive advice on understanding existing sip.
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> > [EMAIL PROTECTED] with
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>
>
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> _______________________________________________
> This list is for continuing development of the SIP protocol.
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