Measure the test taker's understanding about the concept of SIP relay.

In the process of learning the SIP protocol, we need to be clear about a concept, that is, the concept of SIP relay. In order to help you better understand this aspect, we use a comparison between Chinese and English translations to help you understand this aspect. The specific information is as follows:

A sip Trunk is a logical connection between an ip pbx and a Service Provider's application servers that allows voice over IP traffic to be exchanged between the two. when a call is placed from an internal phone to an external number, the PBX sends the necessary information to the SIP Trunk provider who establishes the call to the dialed number and acts as an intermediary for the call. all signaling and voice traffic between the PBX and the provider is exchanged using SIP and RTP protocol packets over the IP network.

A sip relay is an Application server of an ip pbx and a service provider, so that the voice logic connection IP traffic is exchanged between the two. When a call is placed from an internal phone number to an external phone number, the switch sends the necessary information to the provider of the SIP relay who established the call number and acts as a call intermediary. The exchange and provider between all signals and voice communication switches use the SIP and RTP protocol packet networks through IP addresses.

If the number being called is a traditional PSTN telephone, the trunk provider routes the IP packets to a PSTN Gateway that is closest to the number being called, to minimize possible long distance charges. the provider can also terminate PSTN numbers, and route incoming callfor those numbers back to the ip pbx over the SIP can also Trunk. this allows businesses to offer local phone numbers in several geographical areas, but service them all from a single location.

If the number is called a traditional PSTN phone, the trunk provides IP packet routing to the PSTN gateway, which is called the nearest number, to minimize possible long-distance telephone charges. The provider can also terminate the PSTN number, and the ip pbx returned for these numbers on the campus route can also be used. This allows enterprises to provide local phone numbers in several geographic regions, but services are all from one location.

If the number being called can be reached over a SIP Trunk, the call does not need to be routed over the PSTN, but can be carried on the IP network end to end. providers can deliver these callto their MERs for very little cost, and buy offer them at no charge. some service providers have agreements and exchange CILS for each others directmers directly over their IP networks. where no such agreements are in place, callare routed over the PSTN, even though both endpoints may ultimately be reachable over a SIP Trunk.

If this number is called, a consensus can be reached through a SIP relay, and the call does not need to be routed in the PSTN, but the IP address can end at the end of the network. Suppliers can provide these customers at very low cost and many offer them for free. Some service providers EXCHANGE Customer requirements for each other through the IP network protocol. If no such protocol is in place, the call route is in the PSTN, even if the two endpoints may eventually reach more than one SIP relay.

The SIP Trunk can be provided by the Internet Service Provider, or by an independent Internet Telephony Service Provider. in fact, there can be several parties involved, each one providing a different part of the service needed to deliver the end-to-end communication: Internet access, SIP termination, PSTN gateway, etc.

This SIP relay can provide Internet service providers, or an independent Internet telephone service provider. In fact, there may be several clients, each of which provides the required communication between the terminal and the terminal: Internet access, termination of the SIP protocol, PSTN gateway and other services.

Because a SIP Trunk is not a physical connection, there is no explicit limit on the number of CILS that can be carried over a single trunk. each call consumes a certain amount of network bandwidth, so the number of CILS is limited by the amount of bandwidth that can flow between the ip pbx and the provider's equipment.

Because a SIP relay is not a physical connection, you can impose explicit trunk restrictions on a single phone number. Each call consumes a certain amount of network bandwidth, so the number of telephones is limited, and the number of ip pbx and supplier devices can flow between them.

For marketing reasons, please providers associate a SIP Trunk with a single phone call. when you purchase such a SIP Trunk, it provides the ability to place one call at a time through the service provider's network. organizations purchase as your trunks as they need to support their specific needs, typically one trunk per 3-5 employees. some providers allow several cballs to be carried over a single trunk.

For market reasons, many vendors bring a single phone call to the SIP relay. When you buy such a SIP relay, it provides a network that can be accessed by a telephone service provider in one place. Organizations purchase as many trunk trees as possible because they need to support their specific needs. Generally, every 3-5 employees have trunk trees. Some suppliers are allowed to call more than one trunk multiple times.