Remote H323 Extension

[tnoe]

I have configured out IP Office 500 for the Remote Extension feature and cannot get the phones to register. They make contact but then go into "Discovery" looking for the internal IP address which can only be coming from the IP Office config.

Under LAN1/Network Topology I have listed the external IP address under Public IP Address but is there another config option I have missed?

Confused in Richmond

[mkumarpandey]

The user has a H323 phone behind a domestic router. It is assumed that the domestic router allows all outbound traffic from the home network to pass through and allows all symmetric traffic. That is, if the phone sends RTP/RTCP to a public IP address and port, it will be able to receive RTP/RTCP from that same IP address and port.
If this is not the case, the configuration of the user's router to support that is not covered by this documentation.
If this does not help, check any firewalls, IP routing, ports opened etc. Please open Service request and we will assist further on this.

[wkirk]

Sorry we can't test but these are the instructions from the IPO KB:

Remote H323 Extensions
http://marketingtools.avaya.com/knowledgebase/businesspartner/ipoffice/mergedProjects/manager/remote_http_extensions.htm


For IP Office Release 8.0+, the configuration of remote H323 extensions is supported without needing those extensions to be running special VPN firmware. This option is intended for use in the following scenario:

•The customer LAN has a public IP address which is forwarded to the IP Office system. That address is used as the call server address by the H323 remote extensions.
•The user has a H323 phone behind a domestic router. It is assumed that the domestic router allows all outbound traffic from the home network to pass through and allows all symmetric traffic. That is, if the phone sends RTP/RTCP to a public IP address and port, it will be able to receive RTP/RTCP from that same IP address and port. If this is not the case, the configuration of the user's router to support that is not covered by this documentation.

Kirk

W.K. "Kirk" Kirk | Avaya | TechniCenter Engineer | Technical Support and Proposal Management ~ SME Pre-Sales Support
Highlands Ranch, CO 80129 | Voice: 1-888-297-4700 | [email protected]
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[ista4]

My experience with the remote worker is that it can work or it doesn't work.
This all has to do which router is used at the office site but also on the remote site.
Some router just won't allow it and won't let the phone register or don't passtrough the RTP stream.

But this must be configured:

1) enable remote worker on the lan port that is used for this
2) set up stun if the IPO is not connected to internet without NAT (NAT -> STUN)
3) enable remote worker on the used extension
4) enable remote worker on the user.

Then on the phone turn of 801.q (important)
Set the external IP address on the phone.

Be sure that these ports are forwarded if the IPO is not on the internet.

1719 UDP
1720 TCP
RTP ports configured on the LAN port (remote worker part)
ICMP must be enabled for the public IP address used for the remote worker.

Good luck

[ferre69]

Allowing ICMP traffic solved my issue

Thanks for the guidance with allowing ICMP traffic on the remote user side. I originally had a Linksys E1500 and E900 that I was using for my router, but neither worked. I installed an ASA so I could identify the traffic that was being block. After reading this thread and checking my logs, I saw what was happening. I set a policy to allow ICMP traffic from the public IP of the phone system and now audio works.

I hope this helps resolve the same issue for others down the road.