[dennissmith20]

I have an SPA9000 using a public IP with 8 stations (combination of SPA9xx phones) connected via internet access behind other routers. None of the stations are on the same subnet as the 9000. Everything works well with two exceptions that I have not been able to resolve.

1. I can not get station to station dialing working. When I dial another station, the far end rings but there is no ring in the earpiece of the calling station. There is also no audio path from either direction. I can make outbound calls and receive calls from outside with no trouble. Just can't talk station to station. I can however cfwd to another station using the SPA942 cfwd setting.

2. I can not get shared lines working with more than 1 phone on each subnet. Most of the phones are set up to work from home and are on different segments. With those, shared lines work fine. One station can put a call on hold and it can be picked up from another station in a different city. Here is the weird part. If a second station is added to any of the homes, only one phone will accept incoming calls. When I say 1 phone, I don’t mean one of the two at the home; I mean only one of all phones connected to the 9000 using the shared line.

Any thoughts?

Thanks,

Dennis

[humba3]

Your first problem is most likely due to NAT - you have NAT on both sides which is likely to cause some problems. You can verify that by sniffing the WAN port at one of the locations that is receiving a call from another location.. depending on what the sniffing shows, further steps can be taken.
For 2) try some sip traces to see what's going on. I suppose the SPA9k is getting confused when it sees two contacts with the same IP (I take it when you add a second phone, you use other local ports on the second unit.. else you have a NAT problem again as you'd have the same public IP and local port so the router in that segment wouldn't know where to send incoming signalling packets to.

[dennissmith20]

They are definetly behind a NAT. Loading the external IP will allow the phones to connect provided every phone uses a different port.

I hadn't considered the way it looks to the 9k. I went back and looked... sure enough, the phones are registered with the external IP address. It makes sense now.

I think I have the shared extensio worked out also. I think the shared extensions use the same SIP port which if done behind a NAT prevents the 9k from identifying the devices.

Thanks

Dennis