Patent ID: 8495231
Filing Date: 2013-07-23
Classification: H04L,H04M

Abstract:
1. A remote call control method comprising: exchanging a session initiation protocol REFER message associated with a call control request requesting a call control operation; determining the absence of a norefersub tag from a header of the REFER message; triggering a subscription in response to determining the absence of the norefersub tag from the header of the REFER message; identifying a resource associated with the call control request, wherein the resource includes one or more parameters of the call control request that indicate a type of call control operation; determining that, even though the norefersub tag is absent from the header of the REFER message, the call control operation is transactional-only, the determining based on the type of call control operation being performed; terminating the subscription in response to determining that the call control operation is transactional-only while allowing the call control operation to be performed; and performing the call control operation according to the parameters of the call control request.