Hi. I have some Avaya 9640 telephones connected to Asterisk. The phones are flashed to SIP 2.6.17 firmware and they seem to be working nice. Something I cannot get working is MWI and I am hoping someone out there has a solution.
I have been searching like mad and find generally the following…
change the chan_sip source code and recompile
MWI works but I can only see these very few reports when using really old firmware
From the above, I can’t go back to using old firmware and changing chan_sip seems a huge overhead and soon, I will move to pjsip (long overdue).
All typical phones I use, Aastra, Grandstream, Yealink, Zoiper for example all work out the box with MWI but the Avaya ones just don’t seem to take.
Any experience out there would be greatly appreciated.