What is record-route header in SIP?
The Record-Route header is inserted into requests by proxies that wanted to be in the path of subsequent requests for the same call-id. It is then used by the user agent to route subsequent requests.
What is the SIP request line?
SIP requests are distinguished from responses using the start line. As indicated earlier, the start line in the request is often referred to as the request line. It has three components: a method name, a request-URI and the protocol version. They appear in that order and are separated by a single space character.
What is header in IMS?
IMS Connect uses fields in the headers of messages sent to OTMA to communicate processing options and other information to IMS. OTMA defines the format and valid values of the message headers. The fields of the OTMA message header are grouped into sections based on the purpose of the fields.
What is tag header in SIP?
The SIP From Header Tags object allows the 2020 IMG to add or limit the ISUP Originating Line Information parameter and ISUB Encoding parameter between the incoming and outgoing leg of a call. These parameters can be inter-worked from SIP to ISUP and ISUP to SIP.
What are SIP methods?
SIP is a text-based protocol with syntax similar to that of HTTP. There are two different types of SIP messages: requests and responses. The first line of a request has a method, defining the nature of the request, and a Request-URI, indicating where the request should be sent.
What is a SIP header?
A header is a component of a SIP message that conveys information about the message. It is structured as a sequence of header fields. SIP header fields in most cases follow the same rules as HTTP header fields.
What is the P-Asserted-Identity header field in SIP?
The P-Asserted-Identity header field is an important SIP header used among trusted SIP entities (typically intermediaries) to carry the identity of the user sending a SIP message as it was verified by authentication.
How many header entries are in a SIP INVITE message?
A SIP INVITE message contains typically between 4 and 6 header entries with contact information inside them.
Does the “to” header contain a SIP URI?
The “To” header field MAY contain a SIP URI, but it may also make use of other URI schemes (the tel URL (RFC 2806 [9]), for example) when appropriate. All SIP implementations MUST support the SIP URI scheme.