公开(公告)号：US10298624B2

公开(公告)日：2019-05-21

申请号：US15682393

申请日：2017-08-21

Applicant: METASWITCH NETWORKS LTD.

Inventor： Salem Amin Al-Damluji ,  George Malcolm Gilbert

IPC: H04L29/06 ,  G06F15/16

Abstract: Measures, including methods, apparatus and computer programs, for use in operating a network node. A method includes, at the network node: receiving a session initiation protocol (SIP) message directed towards a downstream network element, wherein the received message comprises session description protocol (SDP) data indicating a first SDP preconditions setting; forwarding the received SIP message on to the downstream network element with no modifications; in response to forwarding the received SIP message, receiving a rejection message from the downstream network element; on the basis of the received rejection message, determining that the first SDP preconditions setting is not supported by downstream device; generating a second SIP message comprising SDP data indicating a second SDP preconditions setting different from the first SDP preconditions setting; and transmitting the generated second SIP message comprising SDP data indicating the second SDP preconditions setting to the downstream network element.

公开(公告)号：US09807126B1

公开(公告)日：2017-10-31

申请号：US15439556

申请日：2017-02-22

Applicant: METASWITCH NETWORKS LTD.

Inventor： Salem Amin Al-Damluji ,  George Malcolm Gilbert

IPC: G06F15/16 ,  H04L29/06

CPC classification number: H04L65/1006 ,  H04L65/105 ,  H04L69/03

Abstract: Measures, including methods, apparatus and computer programs, for use in operating a network node. At the network node a database of session description protocol (SDP) precondition preference data for a plurality of network elements is maintained. A session initiation protocol (SIP) message directed towards a downstream network element is received. The received message includes SDP data. A lookup in the database in relation to the received SIP message is performed to retrieve SDP precondition preference data for the downstream network element. The received SIP message is processed according to the retrieved SDP precondition preference data. The processed SIP message is transmitted to the downstream network element.

公开(公告)号：US10686846B2

公开(公告)日：2020-06-16

申请号：US16378292

申请日：2019-04-08

Applicant: Metaswitch Networks Ltd.

Inventor： Salem Amin Al-Damluji ,  George Malcolm Gilbert

IPC: H04L29/06

Abstract: Measures, including methods, apparatus and computer programs, for use in operating a network node. A method includes, at the network node: receiving a session initiation protocol (SIP) message directed towards a downstream network element, wherein the received message comprises session description protocol (SDP) data indicating a first SDP preconditions setting; forwarding the received SIP message on to the downstream network element with no modifications; in response to forwarding the received SIP message, receiving a rejection message from the downstream network element; on the basis of the received rejection message, determining that the first SDP preconditions setting is not supported by downstream device; generating a second SIP message comprising SDP data indicating a second SDP preconditions setting different from the first SDP preconditions setting; and transmitting the generated second SIP message comprising SDP data indicating the second SDP preconditions setting to the downstream network element.