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When you setup a Cisco or Grandstream ATA to simulate a SIP Trunk as a PBX account, you must use the extension Redirection on Busy to have it rollover to ...

The timer (called an "inter-digit timeout) is a function of the phone device and not the hosted service. In the Grandstream phone, select Account 1 a...

Yes, but it requires some configuration. You need to create two hunt groups with appropriate names like "company A" and "company B" an...

Grandstream phones will ignore user configured ringtones when the alert-info field is set on a SIP Invite. An SVS modification has been made to address ...

There are two settings on Grandstream phones that can be a major cause for dropped calls and should be set to the following: use random port = no nat ...

Under SIP Settings --> Basic Settings, change the Caller ID Display to "Disable". Click Save and Apply.

When a Caller ID does not show on the called party phone, there can be several places to prevent or Block outbound caller ID: 1) The Web Portal:  In the...

When upgrading the Grandstream Phones using the Grandstream URL   firmware.grandstream.com  you may notice the phone does not update before or after a reb...

Grandstream is the only phone that requires you to take out the HTTP:// from the provisioning link. Please remove this and paste just the actual link. R...

The Grandstream UCM6102, UCM6104, UCM6108 and UC6116 IP PBX is typically connected to the Strategic Voice Solutions system with a SIP Trunk. In a scenario...