RFC 2833 DTMF继电器

最后一篇博客文章介绍了DTMF中继。这篇博客文章将重点介绍思科IP电话和思科SIP中继线DTMF中继支持。思科的第一代IP电话不支持RFC2833 DTMF-Relay。根据电话负载，所有数字以SCCP或SIP信令包的形式从带外发送。思科第一代手机在思科统一通信管理器6中被称为A型手机。x SRND(解决方案参考网络设计)指南可在www.cisco.com/go/srnd。A型电话包括以下电话:•7902•7905•7910•7912•7940•7960思科第二代电话支持RFC2833 DTMF中继，当注册了思科统一呼叫管理器版本5.0或更高版本时。这些电话包括:Cisco呼叫经理4中的7906、7911、7941、7942、7945、7961、7962、7965、7970、7971、7975 SIP中继。x不支持RFC2833 DTMF-Relay，但在Cisco Unified Call Manager 5.0中引入了对该协议的支持。RFC2833支持对于多厂商互操作性非常重要，因为这是厂商之间交换DTMF数字的首选方式。电话经理4。x使用MTP(媒体终止点)媒体资源将带外SIP通知DTMF消息转换为RFC2833带内消息。 Java Telephony Application Protocol Interface (JTAPI) connections used for CTI (Computer Telephony Integration) ports in CUCM only support out of band DTMF messages. JTAPI connections are used to connect CUCM servers to other servers in the unified communications architecture. JTAPI integrations are used to connect CUCM to Cisco Emergency Responder (CER) and or UCCX (Unified Contact Center Express). UCCX is commonly referred to as CRS (customer response server) or IPCC (IP Contact Center). Have you run into any problems related to DTMF Relay or SIP interoperability? What would like to see covered in the next blog post? Feel free to comment on anything in this blog or anything you would like to see covered in future blog entries.