Protocol use for Cisco Unified Communication System Architecture

We have previously introduced the overall structure of Cisco's Unified Communication call system. Now let's take a look at the core features of SIP implementation and other supported functions. We hope that the introduction and analysis in this article will help you understand this part of knowledge.

Cisco deploys SIP based on RFC to implement core telephone features. To provide many SCCP-based features, Cisco Unified Communication also supports other SIP functions, part of which are from the upcoming RFC. The system can also use the Cisco Unified Presence Server to detect and transmit the user's network status information.

The customer will benefit from the consistency of the call characteristics on the SIP and SCCP phones. For example, a SIP or SCCP phone can have the same extension number. In addition, the call can be retained from a SIP Phone, and then picked up from a SCCP phone-and vice versa.

SIP running on Cisco uniied IP Phones 7905G, 7911G, 7912G, 7940G, 7941G, 7941G-GE, 7960G, 7961G, 7961G-GE, 7970G, and 7971G-GE can help customers obtain system-level SIP features, for example, network status and interoperability with third-party SIP services. In addition, the SIP terminal helps Cisco uniied CallManager 5.0 configure, register, and manage special SIP calls and third-party SIP calls.

The SIP relay interface on Cisco uniied CallManager 5.0 complies with RFC 3261 and supports many other sip rfc. It can integrate a series of voice and video call applications on the SIP Trunk Line. When with Cisco Unity? When the uniied Messaging system is used together with the Cisco Unified MeetingPlace Messaging multimedia conferencing system, the interoperability on the Cisco Unified CallManager SIP relay interface can improve the Conference and application support. Through the use of SIP relay and SIP network interfaces, telecom operators can provide new services that support SIP and network status for their enterprise customers.

Because Cisco Unified CallManager has built-in SIP support, customers can obtain a package of solutions to provide enterprise-level features and functions, enhance interoperability, and support SIP application innovation. Currently, Cisco clients with corresponding valid service contracts can upgrade Cisco Unified CallManager 5.0 to the SIP function for free.

For details about Cisco Unified Communication, visit www.cisco.com/go/voice.

Cisco uniied CallManager Express

Cisco uniied CallManager Express supports local SIP relay for SCCP or SIP phones. SIP relay can help customers use the new SIP relay service provided by telecom carriers, and give full play to the role of other services in Cisco Unified Communication.

Cisco uniied CallManager Express 3.4 can be used as a registration server and Back-to-Back User proxy B2BUA), in which the local SIP Phone is registered with Cisco uniied CallManager Express. This feature enables network design to support a wide range of deployment modes. For example, the Cisco uniied CallManager Express site can send messages directly to another Cisco uniied CallManager Express site or a Cisco uniied CallManager site. In addition, Cisco uniied CallManager Express can send messages to more advanced SIP proxy servers, which provides the directory call feature to simplify inter-site dialing on the network of an enterprise or telecom carrier.

The batch registration feature with Digest verification simplifies the management of registration from Cisco uniied CallManager Express to more advanced SIP proxy servers. B2BUA provides value-added services, such as call forwarding, reservation, and transfer.

Cisco Unified Communication has rich experience in the SIP relay field. telecom operators that provide SIP management services and organizations planning to migrate to SIP can benefit from this. The ability to use SCCP or SIP terminals locally ensures interoperability and smooth upgrade of hybrid deployment. Customers can use innovative technologies and functions in terminals and applications as needed.

Another feature supported by Cisco uniied CallManager Express 3.4 is registering a network SIP proxy through Digest verification, which prevents third-party malicious calls from registering with the network SIP proxy.

For details about Cisco Unified Communication, visit www.cisco.com/go/voice.