SIP和PRI之间的区别

1.会话发起协议(SIP)：
SIP代表会话启动协议，它是一种通过Internet发送语音的方法。它不仅允许语音呼叫，还允许即时消息，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，不需要任何其他硬件来发信号和控制通信会话，例如Internet协议语音(VoIP)呼叫。

2.主速率接口(PRI)：
PRI代表主要速率接口，它是电信标准。在综合服务数字网络(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，并且它基于用于建立连接的电路交换。

SIP和PRI之间的区别：

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.