SIP Mapping CPC parameter from incoming call to outgoing call.
default - map CPC parameter from PAI TEL header.
or map CPC parameter from From header, if PAI TEL has no CPC.
or map CPC parameter from From header, if there is no PAI header.
or map CPC parameter as default ordinary.
paitel - only map CPC parameter from PAI TEL header if exists.
fromheader - only map CPC parameter from From header if exists.
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