13:36:53 <mentax_> What does milliwatt do? reorder_route_req:55(<0.10740.256>) sending response: 686 PICNIC  milliwatt_route_req:35(<0.10747.256>) milliwatt does not know what to do with this!
14:42:19 <mentax_> So, I can see that user is registered and can make a calls. but issue with incoming calls, I run sngrep and I see │SIP/2.0 410 Not registered when call coming to the system
14:43:23 <mentax_> there is definitely some issue with firewall on the client side. Is there any specific parameters need to be configured for inbound calls?
14:45:27 <mentax_> SmartPBX showing error: NUMBER_CHANGED
15:03:59 <mc_> mentax_: if client firewall issues, check for SIP ALG and disable, or move them to port 7000 (often ALG looks at 5060 traffic only)
15:04:06 <mc_> or TLS
15:06:20 <mentax_> mc_ they are on port 7000. I tried to run SIP-ALG tester and it said that there is no ALG. Other phones running with VPN and kinda work. But without VPN it works 1 time out of 15
15:07:15 <mentax_> incoming calls is failing to voicemail, outgoing calls work as expected
15:08:09 <mentax_> and the client has this issue with previous couple carriers. Trying to figure out what is the root issue of that
15:10:09 <mentax_> I tried 3 different brand phones: Polycom, Snom, Grandstream... Same issue with all off them =(
15:11:08 <mentax_> is there anything else I can try?
15:17:00 <mc_> mentax_: replace their gateway with new hardware?? 
15:17:08 <mc_> get a new ISP??
15:18:40 <mentax_> they use spectrum and it's work fine. The bigger issue is very strict rules on their network. 
15:19:13 <mentax_> same phone works just fine in other location
16:05:41 <mentax_> does sngrep showing keep-alive requests?
16:08:42 <mentax_> mc_ I wonder iff keep-alive interval of 30 seconds will do the magic
16:10:18 <mc_> yeah, see what the firewall is configured for NAT mapping timeouts
16:10:33 <mc_> typically 300s is a recommended lowest expiration
16:10:47 <mc_> but you can get OPTIONS from kamailio to the device to keep the NAT hole open
16:11:38 <mentax_> so, 30s is too small?
16:33:01 <mc_> depends on your client's firewall's settings
16:55:36 <mentax_> by default poly has keep-alive disabled...
16:58:02 <mentax_> I turn it on and set to 360s, look like it fixed the issue