I had the same problem with my Grandstream (GXP2000). I got round it by setting a dial plan in my voxalot account so that 500 is directed to *031500 using SIP Broker as the provider. That works fine and I miss off the * when dialling (although I guess you can leave it in if you want by putting *500 in the dial plan).
Test it in your dial plan on the voxalot website - it should route to "sip:*031500@sipbroker.com"
If you are in US, use *010500 and in Aus *061500
My speed dials work fine though. Did you try using # to send the call?
Last edited by tomblandford; 03-05-2007 at 03:25 PM.
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