[cisco-voip] TP EX90 one way video only

[Gregory Wenzel]

I have been watching these emails fly by and don't quite understand. I recently finished a project where we sold the client Cisco TMS, Cisco VCS and Cisco Expressway, but we had to purchase the dual-nic option to provide the dual nic to provide the traversal to non-traversal calls.

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick Wellnitz
Sent: Monday, June 03, 2013 11:44 AM
To: Chris Ward (chrward)
Cc: sheref hf; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] TP EX90 one way video only

IF it is using SIP, without some sort of firewall traversal or proxy the IP in the SIP SDP will show your 192.168.0.50 address of the EX90 and not the public routable address.

H323 does something similar with ip addressing higher up in the OSI layers which causes issues with some firewalls/NAT devices.

On Mon, Jun 3, 2013 at 8:30 AM, Chris Ward (chrward) <chrward at cisco.com<mailto:chrward at cisco.com>> wrote:
It's most likely the NAT that is causing the issue. You may need to turn on SIP inspection on the router so that it tries to replace the internal IP with the external IP. Without the inspection, the other unit will be sending video to the internal IP which it can't real.

+Chris
Unity Connection TME

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>] On Behalf Of sheref hf
Sent: Sunday, June 02, 2013 4:27 AM
To: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: [cisco-voip] TP EX90 one way video only

Dear all

I have TP EX90 with real IP address; I tried to make video call with another TP
but we face an issue; they can see me but I can't

TP Ex90 ---> LAN ---->Router----> Internet <---- TP Ex90

I configured static NAT on router
//  ip nat inside source static 192.168.0.50 196.2XX.X.XXX

Is there any additional configuration to solve this issue??


Thanks
BR,
Sherif Ibrahim Moahmed
Network Engineer
CCVP, CCNP

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