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01/03/2021

Factory Reseting a Polycom VVX 450

I recently acquired a Polycom VVX 450 off Ebay for £30, which is an absolute bargain for a modern 12 Line SIP phone with OPUS / SILK support. 

There was some risk however, it had previously been used by a VoIP provider that shares its name with a character in the Greek Alphabet and some providers lockdown the configuration to make it challenging to make them work with another provider.

Getting around these locks can occasionally involve intercepting traffic and redirecting it to your own TFTP or HTTP server, however with this phone it didn't seem to be the case.


19/02/2021

Yealink T42G attended transfer fix

I recently started using a Yealink T42G - An older (but still very functional) SIP Desk Phone. Weeks passed without any issues, until I attempted an attended transfer. I'd receive a call, chat to them, hit transfer, dial the next number, hit send, and my desk phone would start ringing again displaying "ReCall" on the screen. If you answer the call, the leg to the phone you wish to transfer to will drop.

Fortunately I was eventually able to find a fix. I presume the same fix will work on the other T4X series phones, including the T40, T41 T46 and T48