3CX PBX in the Cloud
1 year FREE - no ties!
google cloud platform
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Zero Admin
With the new Dashboard
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Bulletproof Security
With SSL certs and NGINX
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Install on $200 Appliance
Intel MiniPC architecture
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New, Intuitive Windows Client
More themes, more UC
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More CRM Integrations
Scripting Interface to add your own
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Improved Integrated Web Conferencing
iOS and Android apps included
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Run On-Premise or in the Cloud
Google, OVH, Windows & Linux
Fast & easy call management
With the 3CX Web Client

什么是SIP – 会话初始化协议?

SIP是会话初始化协议的缩写,是一种用于建立、修改和终止VOIP电话通话的IP电话信号协议。SIP由IETF 制订,并作为RFC 3261颁布。

SIP 描述建立电话通话所需要的通信。详情请见SDP协议。

SIP已席卷VOIP市场,该协议与 HTTP协议相似,是一种基于文本的、非常开放和灵活的协议,已在很大范围内取代了H323标准。

链接:
RFC 3261
什么是SDP?
什么是H323?