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Clarify RTP NAT handling a bit.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@240328 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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Kevin P. Fleming
2010-01-15 16:28:38 +00:00
parent 37b73283ff
commit 1ef8082cd3
1 changed files with 14 additions and 2 deletions
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16
configs/sip.conf.sample
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@@ -729,8 +729,20 @@ srvlookup=yes ; Enable DNS SRV lookups on outbound calls
;
; nat = no ; Default. Use rport if the remote side says to use it.
; nat = force_rport ; Force rport to always be on.
; nat = yes ; Force rport to always be on and perform symmetric RTP.
; nat = comedia ; Use rport if the remote side says to use it and perform symmetric RTP.
; nat = yes ; Force rport to always be on and perform comedia RTP handling.
; nat = comedia ; Use rport if the remote side says to use it and perform comedia RTP handling.
;
; 'comedia RTP handling' refers to the technique of sending RTP to the port that the
; the other endpoint's RTP arrived from, and means 'connection-oriented media'. This is
; only partially related to RFC 4145 which was referred to as COMEDIA while it was in
; draft form. This method is used to accomodate endpoints that may be located behind
; NAT devices, and as such the port number they tell Asterisk to send RTP packets to
; for their media streams is not actual port number that will be used on the nearer
; side of the NAT.
;
; In addition to these settings, Asterisk *always* uses 'symmetric RTP' mode as defined by
; RFC 4961; Asterisk will always send RTP packets from the same port number it expects
; to receive them on.
;
; The IP address used for media (audio, video, and text) in the SDP can also be overridden by using
; the media_address configuration option. This is only applicable to the general section and