On 24/11/2012, at 2:19 AM, Tiago Geada <tiago.geada at gmail.com> wrote:
> Hello Folks, I am looking for a way that makes asterisk tell remote SIP
party that the IP where they will send RTP is not the same as the one I am
comunicating via SIP
>
> Can this be done anyhow?
>
> I can try and explain:
>
> We have placed a asterisk box in our partners office.
>
> It has eth0 with IP 172.16.1.10 and eth1: 10.34.18.250
>
> linux has its routes set so it can comunicate with several networks in
their offices.
>
> now there is a cisco call manager that we need to communicate with.
Normally via our IP 172.16.1.10, however seems that this cisco uses some sort of
'directmedya=yes' and sets both ends speaking RTP with themselves.
>
> There are some extensions in cisco that have a network 10.134.0.0/16 that
we can only comunicate via eth1
>
> thus when calling cisco (always via eth0) sometimes we need to say that OUR
IP to recieve RTP is not 172.16.1.10, but 10.34.18.250
>
This is a routing issue, not asterisk I think. You are saying you route to cisco
via eth0, it sets up connections to its end points and then drops out of the
media flow, but the end points have no route to the eth0 address so they fail
Linux usually sorts this out and asterisk replies on the address of the
interface it sends out with. So for the most part the response in my experience
if its going out eth1 should use the eth1 ip address.
If you can get to it via eth0 and thats the preferred route then it will have
the eth0 address. If so why can't you change your routing table to use eth1
when you need to go to the cisco then you will have the right address and the
far extensions can respond to you correctly
Or change the cisco network endpoints so they can successfully access your
address on eth0
> can this be done?
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