[SIPForum-discussion] What is the port number in "Invite" request-line? Thanks

[Shmulik Basan]

Stevan hi,

 

The reason is that the proxy is listening to port 5555.

By example one it reference to send the SIP message to this port (port
5555).

By using example two, the SIP message will be sent to the default SIP port
(i.e. 5060)

 

 

 

Sincerely,

* 

Sam Basan

 

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Yuantao Zhang
Sent: Wednesday, June 04, 2008 12:10
To: sip at ietf.org; discussion at sipforum.org
Subject: [SIPForum-discussion] What is the port number in "Invite"
request-line? Thanks

 

Dear all

 

INVITE sip:bob at biloxi.com SIP/2.0:5555

INVITE sip:bob at biloxi.com SIP/2.0

 

Above are 2 "Invite" request-line examples. In example one, it indicates a
port number, 5555. What does the port number mean? 

 

Is it the port number of SIP proxy? Why we include port number here? The SIP
proxy(biloxi.com) application layer who receives this "Invite" should
receive this via port 5555 from lowe layer(UDP). Therefore, The SIP
proxy(biloxi.com) application layer already know the port is 5555. Actualy,
the SIP proxy application layer keeps listening port 5555. 

 

The second "Invite" request-line example is from RFC3261 and does not
include port number. Can I say the port number is useless? So why example
one includes a useless part in "Invite" request-line URL? 

 

Or is the port number is which the UAS is listening to? How the UAC knows it
is 5555 if so? 

 

Any standard on this port number issue? Thanks. 

 

Best regards

Steven



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