对于外部呼叫的引用和随意转发管理
| int eXosip_refer_build_request | ( | osip_message_t ** | refer, | |
| const char * | refer_to, | |||
| const char * | from, | |||
| const char * | to, | |||
| const char * | route | |||
| ) |
函数描述：创建一个默认的引用消息，向外呼叫转发
| int eXosip_refer_send_request | ( | osip_message_t * | refer | ) |
函数描述：初始化一个随意转发的请求