Sipgate Trunking

The option P-Preferred must be enabled for the SIP header for the SIP provider Sipgate Trunking.

Go to VoIP -> Settings -> SIP Provider -> <sipgate_trunking> -> Advanced Settings.

VoIP -> Settings -> SIP Provider -> <sipgate_trunking> -> Advanced Settings

Proceed as follows to extend the SIP header:

Enable the option P-Preferred under SIP Header Field(s) for Caller Address.
Leave the remaining settings unchanged and confirm them with OK.

	Note
	If the PBX Wizard is used again for this connection, then all settings are reset in the VoIP -> Settings -> SIP Provider menu.