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2.2.1.6 Ms-Subnet Header Field Syntax

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This protocol defines a new Ms-Subnet header field.<6> The ABNF, as defined in [RFC5234], syntax for the Ms-Subnet header field is as follows:

 Ms-Subnet = "ms-subnet" HCOLON ms-subnet-value
 ms-subnet-value = IPv4address

The ABNF for IPv4address is specified in [RFC3261] section 25.1.

The UAC SHOULD add, at most, one Ms-Subnet header field in the REGISTER request to the SIP registrar.<7>