Yealink BLF/MWI Subscribe Interestingness

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Adrian Fretwell

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Aug 13, 2017
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This is one for the Yealink gurus out there...

I am bench testing a mid-registrar proxy, and thus far everything is working fine apart from (some of) the NOTIFY messages for the BLFs etc. The phone I'm using is a T27G, Firmware Version 69.84.0.15

I have the PBX SIP address set up in Server host (1) on the account screen. I also have the mid-registrar address set up in Outbound Proxy Server 1 on the same screen.

The phone sends both REGISTER and INVITE messages to the mid-registrar address only, but it sends SUBSCRIBE messages to both the PBX SIP address address and the mid-registrar address.

I don't think this should be normal behavior or am I missing something?
 

Adrian Fretwell

Well-Known Member
Aug 13, 2017
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Update: Well, it was just that T27G, other Yealink phones have behaved as expected. Certainly had me going around in circles for a while, trying to figure out what was happening with SUBSCRIBE messages.

Factory reset, install latest T27 firmware - all good.
 
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