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GrandCentral + SIP DTMF = Missed Calls?

Posted on October 8th, 2008 by willfe

Are you using a SIP-based VoIP gadget for your phone service and having trouble with GrandCentral’s “press 1 to accept this call” prompt ignoring your frantic mashing of [1] on your phone and dropping the call?1

Grab your configuration guide for your SIP adapter, and make sure you’re only sending DTMF tones via “SIP INFO” — that keeps voice prompt systems working (the kind you have to bang numbers into, like banking and automated support lines, etc.) and somehow pokes GrandCentral into working. Disable all other means of sending DTMF tones. On a Grandstream device that’s pretty easy. On other devices, it may be easy, or may require fun and games with telnet. Good luck!

  1. Yes, I’m aware this is a somewhat limited-scope problem. It affected me, though, so I’m sharing the fix. So sue me.2 Smiling ↩

  2. No, dammit, don’t actually sue me. ↩

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