On Thu, 2009-11-19 at 14:47 +0800, Zhaoning Jiang wrote: > SIP gurus, Please help identify this issue. > > Do Standard allow send Port=0 with FQDN in Req-URI? > > like > [email protected]:0 ? > > I went through RFC3261 and did not find answers.
The difficulty is that port 0 is a perfectly valid port for both TCP and UDP (see RFC 768 and RFC 793) but that many TCP/UDP stacks do not handle the specification of port 0 correctly (e.g., the "Berkeley sockets interface", which uses a port number of 0 to designate an unspecified port). Hence, although port 0 is technically valid, one should avoid using it, as any operation with it is unlikely to work. Dale _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
