Patent ID: 9456077
Filing Date: 2016-09-27
CPC Classification: H04L,H04M

Claim Text:
1. A communication server, comprising: a receiving unit configured to receive a first terminal ID and a second terminal number from a first terminal transmitting a conversation request signal via an IP network, the second terminal number being a phone number in a PSTN (public switched telephone network) of a second terminal receiving the conversation request signal; a search unit configured to search for a specific phone number for the first terminal in use of the first terminal ID and the second terminal number in a database, the database comprising a plurality of phone numbers of a plurality of terminals, a plurality of ID information for the plurality of terminals, and specific phone numbers associated with the plurality of phone numbers and the plurality of ID information; a notification unit configured to notify the second terminal of the specific phone number; an assignment unit configured to, in a case when the specific phone number cannot be specified by the search unit, assign a specific phone number in association with the first terminal ID and the second terminal number; and a recording unit configured to record the first terminal ID, the second terminal number and the specific phone number in the database.