How does Obi Get MWI?
thetoad30:
I understand that.
I'm looking for deeper settings that the OBI is interpreting from any kind of "signal". My Cisco device and the PhonerLite softphone doesn't "know" how to get those messages - my question is why?
What is the OBI doing/subscribing to/interpreting to figure out that there is or isn't a message waiting?
Why is my OBI interpreting the signal, but my Cisco or PhonerLite can't? That's the piece I'm missing.
SteveInWA:
There are two methods that the OBi can use to learn about MWI -- unsolicited NOTIFY and SUBSCRIBE. The method that will work depends on the SIP VoIP carrier involved. With Callcentric, for example, there's no need to enable SUBSCRIBE, since the Callcentric VM server is sending the MWI NOTIFY message when there's a message. If your ITSP doesn't provide that service, then the user agent (OBi or Cisco in your case) needs to enable the SUBSCRIBE method, which requires knowing the ITSP's VM server's address, etc. So, if your OBi is toggling the MWI off and on, and you haven't enabled SUBSCRIBE (I bet you didn't, since you wouldn't know the parameters to enter), the OBi is listening for the unsolicited notify messages.
There's more about this in the OBi administration guide. Search the PDF on "MWI"
Everything you want to know about SIP and MWI in a Cisco SIP environment is here:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/12-4t/sip-12-4t-book/voi-sip-mwi.html#GUID-E887F03B-2957-4D82-AAFF-88E14D53FABA
SteveInWA:
Bottom line: I would expect Vestalink to provide some help and tech support for enabling this feature on your IP phone.
thetoad30:
Thank you for that explanation.
I do believe somewhere the OBI is subscribing - looking at this URL:https://intelafone.desk.com/customer/portal/articles/1413429-mwi-on-obi-stuttering-dial-tone-message-waiting-notification
What I can't tell is where the OBI is subscribing to...
And I agree - I'd hope that Vestalink would provide support, but then in a support e-mail they stated they don't support customer devices... which is really weird, considering they are set up and have BYOD in their title and product descriptions...
SteveInWA:
As an experiment, why don't you get a free NY DID from Callcentric, along with their free voicemail, and see if MWI/VMWI works on your IP phone? I use Callcentric on an OBi, a Grandstream ATA, and a Gigaset IP phone system, and all of them correctly handle MWI.
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