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2.2.1.7 Ms-Device-Info Header Field Syntax

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This protocol defines a new Ms-Device-Info header field<8>. The ABNF syntax, as defined in [RFC5234], for the Ms-Device-Info header field is as follows:

 Ms-Device-Info = "Ms-Device-Info" HCOLON ms-device-info-value
 Ms-device-info-value = mac-info COMMA vendor-info COMMA version-info
 mac-info = "MAC" EQUAL mac-addr
 mac-addr = ^(([a-fA-F0-9]{2}-){5})([a-fA-F0-9]{2})$|^(([a-fA-F0-9]{2}-){7})([a-fA-F0-9]{2})$
 vendor-info = "vendor" EQUAL pvalue
 version-info = "version" EQUAL token

The ABNF for pvalue and token is specified in [RFC3261] section 25.1.

The UAC SHOULD add, at most, one Ms-Device-Info header field in the REGISTER request to the SIP registrar.<9>