| 摘要 |
In one embodiment, the gateway includes a trunk interface module (TI) for coupling the gateway to a trunk of the public network (PSTN), a media Server module (MS) coupled to an enterprise network, a transcoder module (TC), a call control module (CC), and a proxy module (PRO). The proxy module is configured to forward each SIP message received by the gateway, according to the IP address contained in a SIP Request-URI in this message. The SIP message is either sent to the Call Control module (CC) if this IP address is the address of the gateway, or to the data compression module (DC) if the IP address is the address of the main SIP Server (MSS). The proxy module is configured to add, in the latter case, its own IP address in Path header on each Register method; and, for each other SIP method sent to the main SIP Server (MSS), suppress its own IP address in the Route header. The gateway includes a management and configuration module (MC) configured to receive and store a rescue call number to be used for establishing the backup link (BL). |
