Reddit thread suggests increasing the firewall UDP timeouts, worth a try?
“Go to UniFi > Site Settings > Advanced. Uncheck "Auto" for the Firewall Timeouts / Connection Tracking. Change "UDP Other" to 120 seconds and UDP Stream to 210 seconds. Save.” From: AF <[email protected]> On Behalf Of Josh Luthman Sent: Monday, March 23, 2026 12:46 PM To: AnimalFarm Microwave Users Group <[email protected]> Subject: Re: [AFMUG] UBNT Router blocking some SIP Traffic Are you sure it didn't just turn on SIP ALG? On Mon, Mar 23, 2026 at 10:16 AM Nate Burke <[email protected] <mailto:[email protected]> > wrote: I've run into a couple instances of UBNT routers randomly blocking SIP Phone traffic. One of my customers with 2 locations changed to the UBNT Dream Router 7 last year. Randomly, like every 2-3 months, it will just decide to block SIP traffic from a single handset in the office. Rebooting the router doesn't change anything and sometimes breaks an additional phone. If I change the LAN Address of the handset, it will start working again. I've ask their IT people, who claim to have Whitelisted the SIP Server, and have disabled SIP ALG. Are there any other settings that would be blocking specific handset SIP traffic? I've only ever run into this one time before with an Old ORBI router. Exact same scenario. Could never find anything in the settings that was blocking the traffic, but assigning a new LAN Address to the handset fixed it. It is specific to SIP traffic, the phone can ping/HTTP out to the internet without issue, it's not like it's blocking the all the phones IP traffic. -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
-- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
