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What is Refer – To Header Field in SIP?

The Refer-To header field is a compulsory header field in a REFER request, which holds the URI or URL resource that is being referenced. It may have any type of URI from a sip or sips to a telURI.

What is Priority Header Field in SIP?

The Priority header field is used by a UAC (Universal Agent Client) to place the importance of a request. Values are non-urgent, normal, urgent, and emergency.

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