[asterisk-users] SIP and RTP on different IP's

[Tiago Geada]

yes I have no control over that.

Ok we will figure another way. Thanks


On 25 November 2012 07:10, Duncan Turnbull <duncan at e-simple.co.nz> wrote:

>
>
> On 25/11/2012, at 1:23 PM, Tiago Geada <tiago.geada at gmail.com> wrote:
>
> linux does sort this out and asterisk listens in both interfaces. however
> asterisk connects and tells remote end to send rtp back at the same IP
>  where sip is going trough...
>
> remote end does try to send  it but gets stopped in a firewall.. thus if
> asterisk did present a different  IP to recieve RTP in its SIP header, this
> would not happen!
>
>
>
> I think this is outside of asterisk's natural ability
>
> You may need a proxy server in between you and the Cisco to achieve this
> if you can't change the firewall.
>
> http://forums.asterisk.org/viewtopic.php?f=1&t=84018
>
> Have you tried making the preferred route to these addresses go out eth1,
> thus getting the required address?
>
> Ultimately seems odd the firewall allows access in but not out, guessing
> you have no control over that?
>
> Good luck
>
> Cheers Duncan
>
>
> On 23 November 2012 19:39, Duncan Turnbull <duncan at e-simple.co.nz> wrote:
>
>>
>> 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 10.134.0.0/16that 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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