Service Profile Identifier (n)~ An 8-digit to 14-digit number that identifies the services that you order for each B-channel. For example when you order Primary Rate ISDN you obtain two phone numbers and two SPIDs from your Integrated Services Digital Network (ISDN) provider. Typical ISDN adapters cannot operate without configuring SPIDs. service program (n)~ A program that uses Service Broker functionality. A service program may be a Transact-SQL stored procedure a SQLCLR stored procedure or an external program.