Michael wrote: > On Tue, 14 Apr 2009 20:47:29 you wrote: > >> Hi michael, >> >> you should open both tcp,udp 5060,5061 too and as you mentioned between >> 10000-20000. >> > > AFAIK 5061 TCP is for TLS SIP which isn't used much yet? > > Is TCP the default for 5060, with UDP as fallback, or is this provider > dependent? > > Michael > > That's provider dependent. MOST SIP is done with UDP. Some people use TCP to get past firewalls or try and alleviate NAT issues, but it's non-standard and falls into the category of 'complete hack' where SIP is concerned. TCP is allowed via the RFC, I believe (I vaguely remember a transport=tcp setting somewhere in a header field), but whether or not it's supported by the provider or software varies widely. Microsoft uses only TCP in their communicator product, I think. Some clients will let you choose TCP or UDP. But for the most part, when dealing with a default asterisk install and your own phones/softphones, you shouldn't need to worry about TCP.
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