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SIP method options
Business SIP Providers
|Provider||Plan Details||Monthly Rate *|
8x8 IP Trunking
*Taxes, setup, long distance, & other fees may apply. Rates vary from those shown above.
The SIP method OPTIONS allows a UA to query another UA or a proxy server as to its capabilities. This allows a client to discover information about the supported methods, content types, extensions, codecs, etc. without "ringing" the other party.
For example, before a client inserts a Require header field into an INVITE listing an option that it is not certain the destination UAS supports, the client can query the destination UAS with an OPTIONS to see if this option is returned in a Supported header field.
All UAs MUST support the OPTIONS method.
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