Internet protocol for IP private branch exchanges

A method for associating calling name directory information with an incoming telephone call comprising:

• receiving a call setup request including a telephone number from at least one communications device;
• determining whether the telephone number requires calling name delivery information;
• in response to determining that the telephone number requires calling name delivery information:
• querying one or more databases independent from a carrier switch for calling name delivery information related to the call setup request;
• retrieving the calling name delivery information;
• and
• transmitting the calling name delivery information to the at least one communications device;
• and
• in response to determining that the telephone number does not require calling name delivery information, withholding sending calling name delivery queries to the one or more databases.

A method for routing a call comprising:

• receiving a call setup request including a telephone number for an outbound call from at least one communications device;
• determining whether the telephone number requires electronic numbering mapping information;
• in response to a determination that the telephone number requires electronic numbering mapping information:
• querying one or more databases for electronic numbering mapping information related to the call setup request;
• retrieving the electronic numbering mapping information;
• and
• responsive to retrieving the electronic numbering mapping information, routing the call setup request to a network based on the retrieved electronic numbering mapping information;
• and
• in response to a determination that the telephone number does not require electronic numbering mapping information, withholding sending queries to the one or more databases.