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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Yuantao Zhang Sent: Wednesday, June 04, 2008 12:10 To: [email protected]; [EMAIL PROTECTED] Subject: [SIPForum-discussion] What is the port number in "Invite" request-line? Thanks Dear all INVITE sip:[EMAIL PROTECTED] SIP/2.0:5555 INVITE sip:[EMAIL PROTECTED] 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 __________ Information from ESET Smart Security, version of virus signature database 3157 (20080604) __________ The message was checked by ESET Smart Security. http://www.eset.com
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