R9.1.7 incoming SIP calls dropping Netgear fvs336G v3

[mode1]

I am having an issue with incoming calls dropping on a newly installed SIP trunk. Outbound calls stay connected and are clear for duration of call. Its only an issue with incoming calls. They drop after a short time. My firewall is a Netgear fvs336g with current firmware. Built incoming and outgoing lan wan rules. My rules are as follows-Service Any, Action Any, Lan users phone system IP address, Wan Users Any. SIP ALG is off. Any insight would be appreciated!

 

[amriddle01]

You need to determine how long before the calls drop, this will be consistent I'd wager, as this is typical of a router/firewall ALG/fixup/session etc timer.
Then you can login to the Netgear and find a timer that is close to the determined average.
This is 99.9% an issue with the router, always is

 

[mode1]

Thanks for the reply. Its about 32 seconds and I will look at the netgear as I assumed it was causing my trouble I just have not had any luck finder anything

 

[Ragnorak]

You might also check the UDP timeout setting on the Netgear. I've mostly had UDP timeout issues with remote SIP IP phones using port forwarding but it might help.

I have not had great luck with the Netgear FVS series in general. Had a VPN with Netgears a while back and it worked fine until you connected a second IP phone and then both IP phones stopped connecting. Basically the VPN could only handle one IP phone period. Ran that to ground and found the exact issue in the resolved release notes for another Netgear router and tried to follow through with Netgear. No luck. Just eventually replaced the hardware. Done plenty of VoIP implementations with Netgear without issues, but they've been at the root of some very annoying VoIP problems too.

 

[mode1]

More info on this. They have at&t uverse which comes with a pace modem/wifi/firewall. I setup the port on the pace from info i found on internet to connect a seperate firewall. It was called dmzplus. I reconfigured phone system to port I had netgear connected to and all was well. Obviously my issue is in the netgear. For the life of me I can not find the issue. Anyone have any info on the netgear fvs336gv3 firewall and SIP trunks. What maddening is I have same setup at my office using same sip provider and netgear firewall and no issues. Diffeeence being the cable provider supplied modem only no firewall.

 

[Ragnorak]

Those uverse modems don't have a true bridge mode. Have had lots of issues with those and VoIP. Sometimes changing the SIP port away from 5060 helps. Once with SIP trunks I resolved the issue by getting AT&T to switch the service from a dynamic to a static IP address. With the dynamic IP all outbound traffic was showing as from the wrong IP-- one of the IP addresses in AT&T's network from a trace route. Internet still worked but the SIP carrier was seeing the service registered at the wrong IP address. Switching to a static from AT&T resolved this, though I'm not entirely convinced they simply screwed the dynamic circuit.

I have had so many issues with uveerse and VoIP I tell people right away that it simply may never work. Most often it does in the end, but aligning their expectations to anything other than "may never" is only going to cause you more grief in the end.

 

[mforrence]

We stopped using Netgear routers because of the maddening challenges. A couple of sites required a downgrade of firmware to get SIP to work properly, another site with site-to-site VPN and H.323 trunks to a CM, the first call would succeed, but additional calls would fail until five minutes of no traffic. We spent hours and hours, and finally went all Adtran. No issues since...