Through the SIP messages, the two peers initiate a communication session.

通过SIP消息，两个对等体可发起通信会话。

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The SIP address uniquely identifies a user during the creation of a communication session.

SIP地址在创建通信会话期间唯一地对用户进行标识。

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The idea is that one entity wants to initiate communication to another entity, and sends an INVITE to a communication session (Figure 1).

其想法是这样的，一个实体希望发起与另一个实体的通信，并向通信会话发送一个INVITE(图1)。

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The three facilitators from Walter Sisulu University are Adele Moodly for the session on gender policy, Phil Schneider for the communication policy session and Pete Gladwin, who will lead the marketing and creative community programming modules.

UNESCO: MEDIA SERVICES

That means that when a call begins, the network essentially opens a path of communication for the duration of the session between the users.

WSJ: U.S. Wireless Carriers Move to New Technology��For Voice

Devoted to science communication in Southeast Europe, the session offered an opportunity for the eight journalists from the region to outline the situation in their respective countries.

UNESCO: Science Policy and Capacity-Building