Perfectly legal. The ITSP could be using an ingress proxy to terminate
to the switch in which case media and signalling is always different.
There is also a possibility of PSTN gateways where each media processor
board is equipped with their own ethernet ports which is in most cases
is the case for high end boards. Regarding whether its presented in SDP
is not always true. The SDP may contain a Natted IP in which case far
end NAT traversal kicks in.
On 10/27/2011 05:32 PM, pscheep...@epo.org wrote:
If the ip-address of the RTP stream was specified in the sdp part of
the INVITE then all is RFC-OK.
Don't know if this answers the question but no one else replied..
Paul
> Tony Graziano <tgrazi...@myitdepartment.net> wrote on 25-10-2011
12:39:02:
> I don't think it is, but I wanted opinions.
>
> I was asked to look at flowroute for a potential deployment. After
> monkeying around with their portal, which has its own quirks, I saw
> the following behavior...
>
> Invite from FR on port 5080 at their ip 216.x.y.z, then I saw the
> call fail to setup (BYE) from sipx due to no response (timeout) from
> the other side.
>
> In my case this is a dual wan and I routed FR's network via a
> dedicated connection on the router. Works for Appiaservices, voip.ms,
> bandwidth.com, etc., so all is without issue "except" for flowroute.
>
> After doing another test call and getting a pcap from the firewall,
> I noticed the RTP was being sent by a foreign (Level 3) IP address
4.a.b.c.
>
> My question: If the signalling for the call is established with one
> IP address, does a totally different IP address for media break any
> rules? I'm guessing not because the call worked once I routed the
> level 3 address(s) via the other wan connection.
>
> While I don't think it's particularly good behavior, is there
> anything improper other than an ACL or routing rats nest that this
> tye of ITSP routing introduces?
>
> --
> ======================
> Tony Graziano, Manager
> Telephone: 434.984.8430
> sip: tgrazi...@voice.myitdepartment.net
> Fax: 434.465.6833
>
> Email: tgrazi...@myitdepartment.net
>
> LAN/Telephony/Security and Control Systems Helpdesk:
> Telephone: 434.984.8426
> sip: helpd...@voice.myitdepartment.net
>
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> http://support.myitdepartment.net <http://support.myitdepartment.net/>
>
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> http://blog.myitdepartment.net <http://blog.myitdepartment.net/>
>
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>
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