SIP 和 PRI 的区别

1. 会话发起协议(SIP)：
SIP 代表会话发起协议，它是一种通过互联网发送语音的方法。它不仅允许语音通话，还允许进行即时消息、视频聊天、会议或其他通信。它通过 Internet 协议 (IP) 网络建立连接。它用作连接、维护和断开通信会话的信令和控制协议。 SIP 干线是虚拟的，它们不需要任何额外的硬件来发送和控制诸如互联网协议语音 (VoIP) 呼叫之类的通信会话。

2. 主要速率接口(PRI)：
PRI 代表主要速率接口，它是一种电信标准。在综合业务数字网 (ISDN) 中，PRI 用于通过物理线路或电路实现语音、数据、视频传输。它提供对公共交换电话网 (PSTN) 的数字访问。

PRI 电话系统通过传统的铜线电话线连接到 PSTN，它基于电路交换建立连接。

SIP 和 PRI 的区别：

S.No.	SIP	PRI
01.	SIP establishes voice communication over Internet Protocol (IP) network / internet.	PRI needs traditional PSTN phone system for its setup.
02.	In SIP, virtual connection through network/internet.	In PRI, physical connection through PRI circuit (copper line)
03.	In SIP calls are transmitted in data packet format through IP network.	In PRI, calls are transmitted through physical circuits(Traditional telephone lines) .
04.	It is sold per channel.	It is sold per circuit and 23 voice channels are provided under each circuit.
05.	New up-gradation takes less time means some hours to set up and function.	New up-gradation takes more time means several days or weeks to set up and function.
06.	To increase the scalability additional PRI lines needs to be installed.	To increase the scalability additional PRI lines needs to be installed.
07.	It is limited only by bandwidth.	It is limited by limited by the number of traditional wired phone lines.
08.	It also provides very good call quality but if it is badly configured in network then it affects call quality.	It provides very good call quality as it is physically configured.
09.	SIP requires no additional hardware.	It needs each circuit to be physically connected via cables.
10.	SIP costs are lower than PRI.	PRI costs are 30-40% high per line than SIP.
11.	Call diversity across vendors is easily available.	Call diversity across vendors is expensive.
12.	It allows unlimited time and distance calling.	It does not allow unlimited time and distance calling. It charges additional for long distance communication.