ICE BASED NAT TRAVERSAL
    6.
    发明公开
    ICE BASED NAT TRAVERSAL 有权
    基于ICE的NAT漫游

    公开(公告)号:EP2805476A1

    公开(公告)日:2014-11-26

    申请号:EP12700969.4

    申请日:2012-01-17

    IPC分类号: H04L29/12

    摘要: An Interactive Connectivity Establishment, ICE, based NAT traversal mechanism is described for use by originating/terminating P-CSCF nodes (114a/114b) in an IMS network (105). The originating P-CSCF node (114a) receives a SIP INVITE request from first user equipment (UE) (101 ) originating a call towards a second UE (103). If a relay candidate address for the first UE (101) is not present in the SIP INVITE request, the SIP INVITE request is modified to include a first address provided by an originating IMS-AGW node (115a) as a relay candidate for the first UE (101) and forwarded to the second UE (103). The originating P-CSCF node (114a) receives a SIP INVITE response message from the second UE (103) in response to the SIP INVITE request. If a relay candidate address for the second UE (103) is not present in the SIP INVITE response, the SIP INVITE response is modified to include a second address provided by an originating IMS-AGW node (115a) as a relay candidate for the second UE (103) and forwarded to the first UE (101). The corresponding candidate address information is used by the both UEs (101, 103) in ICE procedures. If a relay server is required, then only the IMS-AGW node (115a) is deployed.

    摘要翻译: 描述了由IMS网络(105)中的始发/终止P-CSCF节点(114a / 114b)使用的基于ICE的交互式连接建立,基于NAT的穿越机制。 始发P-CSCF节点(114a)从发起向第二UE(103)的呼叫的第一用户设备(UE)(101)接收SIP INVITE请求。 如果第一UE(101)的中继候选地址不存在于SIP INVITE请求中,则SIP INVITE请求被修改为包括由始发IMS-AGW节点(115a)提供的第一地址作为用于第一 UE(101)并被转发给第二UE(103)。 始发P-CSCF节点(114a)响应于SIP INVITE请求从第二UE(103)接收SIP INVITE响应消息。 如果第二UE(103)的中继候选地址不存在于SIP INVITE响应中,则SIP INVITE响应被修改为包括由始发IMS-AGW节点(115a)提供的第二地址作为用于第二 UE(103)并被转发到第一UE(101)。 在ICE过程中,两个UE(101,103)使用相应的候选地址信息。 如果需要中继服务器,则仅部署IMS-AGW节点(115a)。