[SIPForum-discussion] Multi-recipients in SIP
Manish Aggarwal
maaggarwal at gmail.com
Thu Apr 9 16:37:18 UTC 2009
Hi,
If you are using IPv4, (here is what 3261 says..)
A client that sends a request to a multicast address MUST add the
"maddr" parameter to its Via header field value containing the
destination multicast address, and for IPv4, SHOULD add the "ttl"
parameter with a value of 1.
These rules result in a purposeful limitation of multicast in SIP.
Its primary function is to provide a "single-hop-discovery-like"
service, delivering a request to a group of homogeneous servers,
where it is only required to process the response from any one of
them. This functionality is most useful for registrations.
Before a request is sent, the client transport MUST insert a value of
the "sent-by" field into the Via header field. This field contains
an IP address or host name, and port. The usage of an FQDN is
RECOMMENDED. This field is used for sending responses under certain
conditions, described below. If the port is absent, the default
value depends on the transport. It is 5060 for UDP, TCP and SCTP,
5061 for TLS.
Hope it helps
-Manish
On Wed, Apr 8, 2009 at 11:24 PM, Mahammed F Eessa <
mohammadfaiz2003 at yahoo.com> wrote:
> Hi All,
>
> How can I send a SIP request to multi recipients instead of one only?
>
>
> Best Regards,
>
>
>
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