probchild

I am currently having an issue setting up our Remote IP phones. The system is a S8100. Every site will have a Cisco PIX 501 that will establish the VPN connection to our site. All connections and resources are open on our end and on the 501. I can use the same Cisco PIX 501 and connect a laptop to our network fine (all resources are available).

However, if I connect one of our Avaya 4602 IP phones to the same device, I receive only one way traffic. The user at the remote site can make a call but cannot hear dial tone or the person on the other end of the call. The other person can hear the user at the remote site fine. The phone will also ring correctly at the remote site but the same one way traffic happens. IP to IP phone calls work fine but all others only one way.

The CLAN and MEDPRO both have the default gateway of our router added to them. If I ping the CLAN from the remote site, everything looks fine. When I ping the MEDPRO from the remote site, I lose every other packet. However, Avaya told me this is correct?

Basically, my s8100 works fine in the office. The IP phones connected in the office also work fine and can call all phone types. However, as soon as they are on a different network, I can only get one way traffic. It seems like the voice traffic does not know were to route. Does anyone know of a setting or option I need to change?

stubborne

"If I ping the CLAN from the remote site, everything looks fine. When I ping the MEDPRO from the remote site, I lose every other packet. However, Avaya told me this is correct?"
No, not correct. Not sure why you would be losing ICMP traffic to just the Medpro. The IP audio problem sounds like possibly you're not allowing the right ports out through your proxy (I'm assuming you have a proxy server), altho traffic is allowed in. Do you have any other IP telephony on this network? The signalling uses different ports and, depending on your network QoS, is tagged differently than IP audio. That explains why you can ring the phone. There are lots to look at on the network side, not necessarily the PBX translation side. Have your Net Admin sniff them packets...

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Stu

PBXtech.info

 

probchild

We do not have a Proxy server. However, I got the Remote IP phones to work by changing the CLAN and MEDPRO gateways to our firewall's IP? I still need to find out why I cannot get them to work with the main router since that is where the traffic should be going. All other devices are being routed correctly by using the main router not the firewall like the phone system seems to need.

By the way, getting these to work by changing to the firewall's IP for the gateway also brought up the following issue:
Calls from Remote IP phone to remote IP phone do not work when using the four digit extension (they ring but offer no sound on either end). Making the call as a local call would be made from the office allows the connection to work correctly. The remote IP can call all other phone types in the office by just using the 4 digit DID number. This problem only occurs with remote to remote connections. Any ideas?

stubborne

Definately a routing issue with network address translation issues thrown in. You have to use the firewall as a gateway to get into your network to access your internal resources. Your firewall doesn't have the ability to route traffic between external devices, just external to internal and vice versa. Your network administrator will have to get involved to fix the routing issues thru your router. Your gateway for Clan/medpro should be the local router...

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Stu

probchild

After adding no ip redirects to my Cisco router, voice traffic started to come through. All seems well for now. Even though it did not matter, I also changed Intra-region IP-IP Direct Audio and Inter-region IP-IP Direct Audio in IP network region to "N". However, it still works with these settings left on "Y".

Should I leave these as "N"? It seems to work OK.

Thanks for the ideas Stu.

stubborne

Hey, glad you got it working and posted your solution! IP direct is always a good idea, if your network is set up for it. It allows your IP endpts to pass audio pkts directly freeing up resources on medpros, clans, etc.

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Stu

PBXtech.info