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A Service Profile Identifier (SPID) is simple. It’s your ten digit telephone number, with a suffix of four 1’s that describe a specific ISDN device to the network. As an example, a typical SPID at Cerzán will look like this: NPA NXXXXXX1111 where NPA is your area code, NXXXXXX is your prefix (NXX) and telephone number (XXXX) – e.g. 65155512341111.
