[Asterisk-Users] Re: Media Path Optimization & NAT

[Adam Sherman]

Rich Adamson wrote:
>>>>Now, I would very much like to remove the "canreinvite=no" from the 
>>>>provider's definition on sip.conf, but doing so causes Asterisk to send 
>>>>a re-invite to the provider pointing to a private IP. I thought that 
>>>>correct localnet entries would solve this...
>>>>
>>>By changing to canreinvite=yes, are you expecting the asterisk box to
>>>act as a router, passing rtp traffic from your sip provider through
>>>the box to a sip phone with a private address (without passing
>>>asterisk code in the middle of the rtp session)?
>>
>>No, sorry. I'm looking for Asterisk to not issue the re-invites if the 
>>two devices can't see each other. Think of mobile users who are often 
>>behind the corporate firewall but also travel. I'm trying to avoid 
>>having the media path be "user->corporate lan->pstn provider". I want it 
>>to be "user->pstn provider".
>>
>>If not to accomplish this, what are the localnet configuration entries for?

> When a user is in the office, his phone registers with asterisk, and he
> places calls through asterisk to the sip provider. But, when he's
> out of the office, he takes his phone with him, and you are wanting
> him to make use of the canreinvite=yes to allow his phone to connect
> directly to the sip provider avoiding asterisk (from an rtp perspective). 
> Is that right?

Yes. A softphone on a laptop makes for a more believable example though.

So, is this possible? And, if not, what do the "localnet" entries provide?

Thanks,

A.