在思科MGCP和H.323的特点统一通信管理器

无论是整合或MGCP H.323网关协议时，这个文件将涵盖一些比较差。最后的博客条目相比，这两个网关协议的生存差异。使用MGCP不支持来电显示服务模拟FXO网关语音端口。来电显示和自动号码识别（ANI）服务已经支持通过MGCP控制T1-CAS（随路信令）和T1 PRI（ISDN基本速率接口）很长一段时间语音端口。的Cisco IOS 12.4（15T）代码具有来电显示服务，但早期版本的IOS没有。在12.4（15T）码功能在XJ代码串以及[例如12.4（15T）。H.323网关接口支持NFAS（与设备无关的信令）功能，而MGCP网关没有。所述NFAS功能允许一个在一个PRI承载语音Q.931 d信道长达20个PRI的信令。NFAS将允许在PRI更多的B信道，以容纳更多的电话。 MGCP gateways do not support fractional PRIs, while H.323 does. If MGCP is statically configured, fractional PRI support can be accommodated, but is not officially supported. Cisco’s recommended MGCP gateway deployment configuration uses the automated ccm-manager config and ccm-manager config server commands covered in a previous blog. When these automated configuration commands are used, CUCM registers all 24 channels of the PRI with the MGCP call agent. If a fractional PRI of less than 23 channels is desired, the H.323 protocol is recommended. MGCP support Q.SiG features in Call Manager 4.x, while H.323 did not. Cisco Unified Communications Manager (CUCM) 5.0 introduced the Q.SIG feature . Q.SiG feature support enables multi-vendor interoperability which will not work over the standard Q.931 signaling capabilities of an ISDN circuit. Q.SiG leverages the information elements (IEs) of Q.931 Factility messages to exchange supplementary services such as message waiting indication (MWI) messages between different vendors MGCP has supported gateway encryption via secure Real-Time Protocol (SRTP) since Call Manager 4.0, while encrypted voice call support was not integrated into H.323 gateways until Cisco Unified Communications Manager 5.0. Check the Cisco feature navigator at www.cisco.com/go/fn to determine the IOS requirement of the gateway router to support the SRTP feature. Feel free to share any MGCP, H.323, and SIP feature differences. There are many features that I have not mentioned in this blog. The next blog entry will cover the RFC2833 DTMF-Relay Feature.