SIP-ID as switchboard number with trunk lines

Until now, SIP trunk lines were given the SIP ID as the switchboard number and modified to suit the telephone number. However, this method is not supported by all trunk-line providers. For this reason you use the SIP mapping table—just like the ISDN mapping—to explicitly define the way that telephone numbers are processed.

Example: With 0123456789# -> # the extension numbers of the trunk are mapped 1:1 to the internal telephone numbers.

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