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Voice Gateways System Manual 57
In ethereal trace, the "To" field in SIP INVITE is "1860123"
For incoming calls
VG can remove a prefix in the dialplan and show the number without the prefix on
the phone display. Use the following notation:
"<'replacement string':'received-string'>"
For example:
Set the dialplan to "<8:1860>xxx"
When a number with the 1860 prefix is received (e.g., "1860123"), the prefix 1860
is replaced with the digit 8 and the number displayed is 8123.