This remote phone (GXP2170) is getting a ton of phantom rings.
Here’s the setup:
Remote phone connects to UCM 6202 w/ latest non-beta firmware.
UCM sits behind firewall that lets the remote location’s traffic through.
UCM PBX settings/SIP/NAT sets public IP and local network range, SDP is checked
On the phone, in the Account->SIP Settings->Security, I have the following set to “yes”:
Validate incoming messages
Check SIP User ID for incoming invite
Accept incoming SIP from Proxy Only
Authenticate incoming INVITE
The Extension (1102) is set to allow two simultaneous registrations - one from the on site phone and one from the remote phone.
Standard ports are forwarded to the on site UCM, and at the remote location the ports are forwarded to the phone.
I did a capture - attached. The remote phone is at 184.108.40.206. UCM is at 220.127.116.11. Local LAN scheme on site is 192.168.5.x, and the local LAN scheme at the remote location is 10.0.0.x
The phone is getting these phantom calls every few minutes. I think there is a real call captured in the pcap too - which I think my remote client rejected without looking at it.
Edit: I forgot a potentially important detail. There is only one inbound route on the UCM, to .X - any number. The inbound route sends calls to an IVR outside of office time. I happened to be working on the problem when office time ended, and the phantom calls magically stopped. Might my solution be as simple as defining the DIDs to which inbound calls are allowed to go? The one fly in this ointment is that the on site phones on the same ring group (even 1102, the onsite version of the remote phone) are not receiving phantom calls.
Any help much appreciated, as always!
pcap 200806.zip (89.1 KB)