Patent ID: 8892751
Filing Date: 2014-11-18
Classification: H04L

Abstract:
1. In a packet network which has a separation of call control plane and service bearing plane, a media gateway controller (MGC) provides call control function and a media gateway (MG) provides service bearing function, a method for negotiating a session description protocol (SDP) version between the MGC and the MG, comprising: sending, by the MGC using H.248 protocol, an audit capability command request to the MG to request for information of all SDP versions supported by the MG, wherein the audit capability command request carries a property parameter instructing the MG to return information of all the SDP versions supported by the MG; receiving, by the MGC-using H.248 protocol, an audit capability command response from the MG which contains information of all SDP versions supported by the MG; determining, by the MGC, based on the received information of all SDP versions supported by the MG, an SDP version to be used, which is supported by both the MGC and the MG; sending, by the MGC, a modify request containing the determined SDP version to be used as a value of the property parameter to the MG; and one of the following: receiving, by the MGC, a success response related to SDP version negotiation, after the MG confirms that the SDP version to be used is supported; or receiving, by the MGC, a failure response related to SDP version negotiation, after the MG confirms that the SDP version to be used is not supported.