[SIPForum-discussion] confussion about use of tcp/udp

[Raj Jain]

On Mon, Jun 9, 2008 at 9:09 AM, Dan York <dyork at voxeo.com> wrote:
> You certainly *can* restrict your UA to only using SIP over TCP - as long as
> all other endpoints with which you want to connect support SIP over TCP.
> My experience is that most of the IP-PBXs out there do support SIP over
> either TCP or UDP.  However a lot of the SIP Service Providers (a.k.a. SIP
> trunk providers a.k.a. VoIP Service Providers) seem to currently only be
> supporting SIP over UDP. If you use the Asterisk open source IP-PBX, last I
> knew it also only supported SIP over UDP.

Asterisk 1.6 supports SIP over TCP.

--
Raj Jain