If an incoming internal call is directed to a SIP user, this prefix is added to the calling party ID, if available.
Note: A call is regarded as external if it comes from a "line". If this line is a SIP PBX line, then the call is only external if the incoming calling party ID is preceded by a "0". All other calls are regarded as internal.
    - SNMP ID:
 - 2.33.3.1.2
 - Console path:
 - Setup > Voice-Call-Manager > Users > SIP-User
 - Possible values:
 Max. 15 characters from [0-9]*
- Default:
 - *