[SIPForum-discussion] "maddr" parameter usage in SIP
Robert Sparks
rjsparks at nostrum.com
Mon Jul 23 23:01:57 UTC 2007
19.1.1 is where you'll find the meat:
(talking about URI components):
The maddr parameter indicates the server address to be
contacted for this user, overriding any address derived from
the host field. When an maddr parameter is present, the port
and transport components of the URI apply to the address
indicated in the maddr parameter value. [4] describes the
proper interpretation of the transport, maddr, and hostport in
order to obtain the destination address, port, and transport
for sending a request.
The maddr field has been used as a simple form of loose source
routing. It allows a URI to specify a proxy that must be
traversed en-route to the destination. Continuing to use the
maddr parameter this way is strongly discouraged (the
mechanisms that enable it are deprecated). Implementations
should instead use the Route mechanism described in this
document, establishing a pre-existing route set if necessary
(see Section 8.1.1.1). This provides a full URI to describe
the node to be traversed.
In any case, 3261 is your only source for inspiration on using this
parameter.
RjS
On Jul 19, 2007, at 5:02 AM, mark lee wrote:
> Hi,all:
> In RFC3261 section 18.1.1, "maddr" is used when the request is
> multicasted but "maddr" parameter in Request-URI is unclear in the
> meaning, and how to use it? does it have other use cases except
> this one?
>
> Thanks
> Gogofly
>
>
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