Abstract: For SIP proxy failover in a SIP telecommunication network (SIPN) comprising a plurality of proxies (P1, P2) and a domain name server (DNSR), the method comprises the following steps: storing, in the domain name server (DNSR), the addresses of the proxies that are working; if a first proxy (P1) shuts down, then informing (42) the domain name server (DNSR) that this first proxy has shutdown; then, if a user agent (SIPUA1) sends a domain name system request (43) to the domain name server (DNSR), sending (44), from the domain name server (DNSR) to this user agent, a response only containing the respective addresses of proxies (P2) that are working; and then, said user agent registering itself in a proxy (P2) the address of which is contained in the response from the domain name server (DNSR).

Abstract: A method for establishing a packet flow with another device over a communication network includes determining a first value of a priority indicator based on the type of data flow and exchanging signaling messages with that other device in order to enable the establishment of the data flow. The first value is inserted into the first of those signaling messages. Upon receiving a signaling message having a received value of that priority indicator, a sent value is determined based on that received value, and inserted into the packets of the packet flow.

Abstract: For SIP proxy failover in a SIP telecommunication network (SIPN) comprising a plurality of proxies (P1, P2) and a domain name server (DNSR), the method comprises the following steps: storing, in the domain name server (DNSR), the addresses of the proxies that are working; if a first proxy (P1) shuts down, then informing (42) the domain name server (DNSR) that this first proxy has shutdown; then, if a user agent (SIPUA1) sends a domain name system request (43) to the domain name server (DNSR), sending (44), from the domain name server (DNSR) to this user agent, a response only containing the respective addresses of proxies (P2) that are working; and then, said user agent registering itself in a proxy (P2) the address of which is contained in the response from the domain name server (DNSR).

Abstract: A method for establishing a packet flow with another device over a communication network includes determining a first value of a priority indicator based on the type of data flow and exchanging signaling messages with that other device in order to enable the establishment of the data flow. The first value is inserted into the first of those signaling messages. Upon receiving a signaling message having a received value of that priority indicator, a sent value is determined based on that received value, and inserted into the packets of the packet flow.