Hi All, I have a query regarding the inclusion of port in SIP-URI. The port in the SIP-URI is optional as per the ABNF grammar (RFC 3261 section 25) SIP-URI = "sip:" [ userinfo ] hostport uri-parameters [ headers ] SIPS-URI = "sips:" [ userinfo ] hostport uri-parameters [ headers ] userinfo = ( user / telephone-subscriber ) [ ":" password ] "@" user = 1*( unreserved / escaped / user-unreserved ) user-unreserved = "&" / "=" / "+" / "$" / "," / ";" / "?" / "/" password = *( unreserved / escaped / "&" / "=" / "+" / "$" / "," ) hostport = host [ ":" port ] host = hostname / IPv4address / IPv6reference hostname = *( domainlabel "." ) toplabel [ "." ] domainlabel = alphanum / alphanum *( alphanum / "-" ) alphanum toplabel = ALPHA / ALPHA *( alphanum / "-" ) alphanum IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT Now if hostname is present in Request-URI or Contact (like INVITE sip:[EMAIL PROTECTED] SIP/2.0) is it valid to include the port number in the URI (like INVITE sip:[EMAIL PROTECTED]:8080 SIP/2.0). I feel the mentioned SIP address' port can be resolved at UAS end through a DNS SRV query. Please let me know whether the port MUST be (or MUST NOT be) included in this case. Thanks, Praveen Dandin
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