The value of the SWVC End Point Identifier Service Attribute is a string that is used to allow the Subscriber and Service Provider to uniquely identify the association of the SWVC with a UNI.
[R49] The value of the SWVC End Point Identifier Service Attribute MUST be an Identifier String. [R50] The value of the SWVC End Point Identifier Service Attribute MUST be unique among all SWVC End Point Identifiers in SWVCs purchased by the Subscriber from the Service Provider.