How to display the original Caller ID when call forwarding through Sipgate sip trunk

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[Issue Description]

When an incoming call to PBX's extension and the extension set call forwarding to an external number, at the external side can't see the original Caller Number. 

 

[Cause]

Configuration issue

 

[Solution]

First of all, please contact the SIP provider to get the correct configurations. Then please configure the PBX as below. 

Go to the SIP trunk page->SIP Headers->Outbound Parameters

1. Set the 'From User Part' with 'Trunk Username',

2. Set the 'From Display Name Part' with 'Originator Caller ID Name'

3. Set the 'P-Preferred-Identity' with 'Originator Caller ID'

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1 Comments

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  • 0
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    It seems the Sipgate side made some changes, they request the phone number in the p-preferred-identity field format should be 49xxxxxx instead of 0xxxxxx.

    In that case, you can set the “Inbound Caller ID Reformatting” in the SIP trunk as below to solve the issue.

     

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