Teletronics Enterprise SIP Server User Manual
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TELETRONICS INTERNATIONAL, INC.
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Enterprise SIP Server Tutorial – Dial Plan
s-tut-dp1.51-041228
2.3. Main SIP Header Fields
These are the most commonly used header fields and it is a good idea to know them when writing
Dial Plan. For other header fields, please refer to the RFC3261.
Header Field
Definition
TO
The SIP-URI of the callee or routing sip server
FROM
SIP-URI of the caller
Max-Forwards
Maximum number of hops that a SIP request can pass through till
its destination
User-Agent
Caller’s user agents name
2.4. Main Methods of SIP Request
Method
Definition
REGISTER
Registers the contact information of the user agent
(e.g. current position)
INVITE
Invitation to participate in the session. Requests an opening session
ACK
Acknowledgement to a response that an INVITE request was
received
CANCEL
Cancels pending transactions in the session
INFO
Gives session information
OPTIONS
Queries the server’s abilities
2.5. Regular Expressions
Following Expressions can be used in Matching Patterns.
Symbols
Meaning
^
Match the beginning of the line