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from the above i assume you want that whenever a sip user dial *72 from the phone it will then ask for his extension and after that the call is being forward to particular cellphone. <br />
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yes you can use multiple lines if your phone supports that.<br />
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can you please post some configuration lines of both your VoIP provider and the phone extension?
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from the above i assume you want that whenever a sip user dial *72 from the phone it will then ask for his extension and after that the call is being forward to particular cellphone.

yes you can use multiple lines if your phone supports that.

can you please post some configuration lines of both your VoIP provider and the phone extension?

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We have a Trixbox server set up using an SIP connection and I am trying to set up the phones so that users can dial *72, enter their extension, and then forward the number to their cellphone. &nbsp;They want to be able to do this on the fly for any external number. &nbsp;I have confirmed that multiple lines can be dialed out from one extension, but whenever I set call forwarding to dial to an external line and then call in, the phone I am calling in on rings once and then disconnects. &nbsp;I have tried adding 9, removing 9, etc. &nbsp;How do I get call forwarding working without setting up a separate extension for each external number?<br />
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Thank you
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We have a Trixbox server set up using an SIP connection and I am trying to set up the phones so that users can dial *72, enter their extension, and then forward the number to their cellphone.  They want to be able to do this on the fly for any external number.  I have confirmed that multiple lines can be dialed out from one extension, but whenever I set call forwarding to dial to an external line and then call in, the phone I am calling in on rings once and then disconnects.  I have tried adding 9, removing 9, etc.  How do I get call forwarding working without setting up a separate extension for each external number?

Thank you

Call forwarding to external cell phone number on Trixbox

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.