Exchanging internet protocol version capability information between client devices over a communications network

摘要

In an embodiment, a dual stack (DS) client device (IPv4+IPv6) configures a header of a message for transmission to include a Via header with an IPv4 address of the DS client device, and transmits the configured message to a server via an IPv6 socket for transmission to a target client device. The target client device receives a message from a server in response to the configured message that identifies the DS capability of the dual stack client device based on a Via header that includes both IPv4 and IPv6 addresses. In another embodiment, a DS client device receives a message with a Via header configuration indicating IPv4 and/or IPv6 addresses through which another client device can communicate, identifies the other client device as DS, IPv4-only or IPv6-only based on the Via header configuration and selects a target format for communication with the other client device based on the identification.

主权项

1. A method of operating a first client device, comprising:
receiving a SIP OPTIONS message from a server that originated from a second client device, the SIP OPTIONS message including a Via header with an IPv4 address of the second client device and an IPv6 address of the second client device in a same Via header field of the Via header; and identifying the second client device as a dual stack client device that is capable of communication in accordance with IPv4 or IPv6 based on the SIP OPTIONS message including both the IPv4 and IPv6 addresses of the dual stack client device in the Via header.