I have a large retirement village customer with at 10/10 Comcast fiber DIA used only for there hosted phone service network. The network has 145 Sip phones, and 420 FXS analog extensions split between 15 Grandstream 48 port ATA’s. The network was installed 18 months ago, and since installation, I will randomly have inbound calls to an analog extension route to an incorrect extension. I never had an inbound call to a sip phone router incorrectly, but I have had an inbound call to an analog extension mis-route to a sip phone. A minute or two later you can call that same extension that routed incorrectly and it routes correctly. But if you call it within those few precocious minutes it will mis-route to the same extension. The window is too short to pull a wireshark. It took me a year just to get this information. It also appears to happen in bunches - meaning for that couple minute spam, I may get information that 2 or 3 other calls mis-routed as well.
When tracing the mis-routed call the PBX shows it sends the call out correctly (correct sip headers and all). What makes this difficult is that it is completely random, never the same extensions, never the same time frames, etc. So I’m making changes blindly to try and make it worse or go away - just to try make some progress for the better or worse.
My concern is the size of the network and that somehow the router gets overloaded at times causing this. I had a Balance 20 in, then changed out to a Balance 210 with no change.
My question is it worth trying to upgrade to a Balamce 310 or larger? Is that blind troubleshooting worth the money?
I can’t image that the Grandstream ATA’s are receiving the call then re-routing it, which is why my focus is on the router. I have over 100 peplink balance 20 installed for hosted phone service, and this is the only time I have run into this, but my next largest single site customer is only 80 sip phones and 32 FXS extensions. So I’m leaning towards the overall size of this, but I don’t have an answer for why it’s only the FXS and not SIP phones. If it was a router issue, I’d think it would happen to all endpoints?
Thank you for any insight or suggestions.