Google Voice Voicemails are not activating the message waiting light on my phone
SteveInWA:
There is no reliable way to make it work as you think it will work. Test it yourself and see.
Assumption: Google Voice number forwards to a CC DID. CC DID is provisioned on an OBi device.
Call the Google Voice number from some unrelated phone number. Answer the call on the OBi-attached phone using the CC DID as the SP. Remain on that call.
Call the Google Voice number from a different unrelated phone number. You'll hear a call-waiting beep tone on the first call. Ignore the CW tone. The second call will eventually go to Google Voice VM, depending on the ring period set for the CC DID.
If you set the CC DID's ring period to be significantly shorter than 25 seconds, it may work, but you, the answering party will have to rush to answer the call before it goes to CC VM. Also, if a third call comes in, that call will go to GV VM. It will also interfere with any other 10-digit forwarding phone number's ability to answer the calls, as the CC DID will grab the calls before the other numbers can answer it. Eventually, the user will miss some important voicemail message that ended up on the wrong VM system.
Remember: the very large majority of Google Voice users use the service with linked mobile phone numbers set up with conditional call forwarding. Trying to "win the race" against Google Voice's voicemail will interfere with any other 10-digit forwarding phone number's ability to answer the calls, as the CC DID's VM will grab the calls before the other numbers can answer it.
Bottom line: Google Voice is not a bare-bones SIP telephone service provider; it's an integrated calling, voicemail and messaging service. If users just want bare-bones SIP phone service, then the better option is to pay for it on an ITSP.
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