What isSPID

An SPID or Service Profile IDentifier is a number that is assigned by a phone provider to an ISDN line to identify the services that the ISDN device can access. It is used by the central office switch to determine how to route calls to and from the ISDN device. Depending on the type of switch used, a single ISDN line may require either one, two, or no SPIDs.

Typically, the SPID is a 10-digit ISDN phone number with a few extra digits added on to indicate the specific services associated with that line. For instance, the SPID for the ISDN number (215) 489-2077 might be 21548920770101.


Why is an SPID important?

The SPID is important because it allows the central office switch to correctly route calls to and from the ISDN device, ensuring that the correct services are accessed. Without a valid SPID, calls may not be properly routed and the ISDN device may not be able to access the desired services.

How do I find out my SPID?

Your phone provider should be able to provide you with your SPID. It is typically included in the paperwork provided when the line is installed or activated. If you are unsure what your SPID is, or you need to update it, contact your phone provider for assistance.

Can the SPID be changed?

Yes, the SPID can be changed. This can be done by contacting your phone provider and requesting a change. However, it is important to note that changing the SPID may affect the services associated with the line, so it should only be done if necessary.


An SPID is a unique identifier that is used by phone providers to designate the services associated with an ISDN line. It is important for proper call routing and service access. If you need to find out your SPID or make changes to it, contact your phone provider for assistance.

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