[asterisk-users] Can asterisk support using different ip for rtp?

[Jun Yin]

some vendors(like alcatel-lucent) developed a kind of sip proxy which
includes two parts: one sip signaling module and one or more voice
modules. voice modules are responsible for receiving/sending voice
traffic(RTP). each voice module has its own IP. so , when the sip
signaling part sends out "invite" packet, it has sip ip in its sip
content and different RTP ip in SDP content. (also for 200OK)
Now I'm trying to do a test to simulate that product with asterisk. I
hope asterisk can sends out different rtp address based on user or
domain name. Based on network side, there are many ways to do it: we
can configure the network card with multiple IPs, one for SIP and
others for RTP.  or , we can setup multiple network cards for the
asterisk server, one card is for sip signaling and other cards for rtp
traffic connecting to different carriers.   I think this diagram is
reasonable but I was surprised that asterisk does not support it.
Maybe asterisk can do this by special configuration? or, there is
other free sip proxy software can do this?

Thanks.

> Message: 10
> Date: Wed, 25 Jun 2008 05:15:29 -0400
> From: "Raj Jain" <rj2807 at gmail.com>
> Subject: Re: [asterisk-users] Can asterisk support using different ip
>        for     rtp?
> To: "Asterisk Users Mailing List - Non-Commercial Discussion"
>        <asterisk-users at lists.digium.com>
> Message-ID:
>        <1971b0b60806250215r22c31131l3886a762bc31855f at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On Tue, Jun 24, 2008 at 9:26 PM, Jun Yin <hansyin at gmail.com> wrote:
>
>> Currently, RTP IP have to be the same as SIP IP. But, SIP RFC allows
>> RTP to use different IP as SIP ip.
>>
>> Is there any way to configure it? GUI or CLI? or , will we support it in
>> future?
>>
>
> SIP is decoupled from RTP, so they can emanate from different IP addresses.
> Can you present a scenario where this will make sense (in the context where
> Asterisk is anchoring the media) ?
>
> --
> Raj Jain