12/15/2023 0 Comments Sip port![]() ![]() ![]() The To header specifies the SIP packet's destination.The Via header contains a list of all SIP proxy servers that this packet has passed through, including the initiating client.This particular packet is a SIP INVITE request for extension 401 This is the SIP Request header that tells us what type of SIP message this is.In this case, this is a SIP/UDP packet being sent to port 5060 (the standard SIP port) Note this information will change as the packet passes between SIP proxy servers. This shows the source and destination IP addresses of the SIP packet.Here is a breakdown of the structure of a SIP packet (Click to enlarge). Using wireshark, you can capture SIP packets and read the content of them. For example, both HTTP and SIP use 408 as the error code to signal a timeout error, 404 for 'not found', etc. They are both human-readable, and use similar (if not the same) error codes. SIP uses a very similar message format to HTTP. SIP uses a Via header to track the SIP proxies that the message has passed through to get to its destination. Each email server adds a Received header to the message, to track the route the message has taken. The SIP protocol can be, and usually is, routed through one or more SIP proxy servers before reaching its destination. It is very similar to how email is transmitted, in that multiple email servers are usually involved in the delivery process, each forwarding the message in its original form. SIP does not carry any voice or video data itself - it merely allows two endpoints to set up connection to transfer that traffic between each other via the Real-time Transport Protocol (RTP). Getting your head around SIP and RTP traffic flows is a little daunting at first, but its actually not all that complicated when you understand the purpose of the protocols.Īs its name implies, the Session Initiation Protocol is used to initiate a session between two endpoints. ![]()
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