[Asterisk-Users] BOTH UAs behind same FW/NAT

[Peter Hudec]

thanks for explanation.

It does not solves this problem, but another one :)

	best regards
		hudecof

Olle E. Johansson wrote:

> Philipp von Klitzing wrote:
> 
>>>> You will probably have to use "canreinvite=no" in the UA definitions 
>>>> in the SIP.conf for those two phones..
> 
> 
>> In your case you want the opposite: canreinvite=yes
> 
> 
> A try to sort out these kind of opposite messages:
> 
> When asterisk connects two SIP phones, it tries to be in the middle of 
> the media
> path, to have the RTP stream go through Asterisk. This way, Asterisk may 
> send
> early media and error messages over audio.
> 
> When the call is connected, asterisk can send SIP re-invites and change 
> the path
> of the media stream, so that media flows directly between the two phones 
> instead
> of going through Asterisk. This is canreinvite=yes
> 
> In your situation, for calling between the phones, you propably don't 
> want the
> media stream to go
> 
> SIP UAC -> NAT -> Asterisk -> NAT -> SIP UAS   (canreinvite=no)
> Instead
> SIP UAC -> SIP UAS                  (canreinvite=yes)
> 
> However, I'm unsure if you can have a canreinvite=yes, since you may want
> asterisk to be in the media path when calling outbound...
> 
> Also note that some devices does not support SIP re-invites (according to
> the Asterisk handbook)
> 
> I'm a bit on thin ice here, so if I'm wrong - please, list, correct me 
> so we
> can sort this out.
> /Olle
> 
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