So recently we attempted to try something new and bought some more "modern" phones from Polycom for a customer and found out that their implementation of SRV support was a bit underwhelming.
Essentially, from our testing, they really support/want NAPTR records and "fallback" to SRV but with a very poor implementation IMHO. In a nutshell, their SRV support is limited to UDP only for some reason instead of checking for all SRV record types and weighting by preference. If NAPTR records are configured they will honor those records specifically directing a phone to a TLS/TCP SRV record, but if NAPTR doesn't exist it is basically UDP SRV record or nothing. If only TCP/TLS SRV records are available, the Polycom reports that no SRV records exist.
I was wondering if there was anyone with some polycom clout that could basically get an explanation as to why they implemented it this way and possibly press for a more complete implementation.
We have 10 year old Snom phones that handle SRV records better than this and also support NAPTR records at the same time so there should be no technical reason/limitation for this functionality.
Erik,
Erik,
I tried the 5.4 firmware with the templates you made for the thirdlane release (which I have expanded greatly and added numerous options to), but I also tried upgrading to the latest firmware and the issue still exists.
As mentioned in my original post, if you add NAPTR records they support TLS/TCP, but if it falls back to SRV records only, everything but UDP is ignored.
I'm assuming your using 5.4.x firmware? I dont use SRV records, so I havent had to deal with this. Polycom _does_ support the use of a backup sip server in recent releases. When I configure my polycom phones I generally input the IP address instead of the hostname to avoid issues with DNS. As far as clout, I doubt it. I'm a pretty big fan of their phones and aesthetics (SNOM still look to 1990s for me, but I know Europeans still love them.) But anyone short of Ingram Micro doesn't have enough clout to get anywhere. The reason places like voip-supply can sell their units at or below polycom partner wholesale is because they are buying truckloads of those out-of-warranty phones that never got sold or were restocked but never opened.