rfc9248v3.txt   rfc9248.txt 
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long as the rate of re-registration is limited if the device is long as the rate of re-registration is limited if the device is
moving. moving.
Implementations MUST implement additional data [RFC7852]. RUE Implementations MUST implement additional data [RFC7852]. RUE
devices MUST implement data provider information, device information, devices MUST implement data provider information, device information,
and owner/subscriber information blocks. and owner/subscriber information blocks.
5.3. Mid-Call Signaling 5.3. Mid-Call Signaling
Implementations MUST support re-INVITE to renegotiate media session Implementations MUST support re-INVITE to renegotiate media session
parameters (among other uses). Per Section 6.1, implementations MUST parameters (among other uses). Per Section 6.8, implementations MUST
be able to support an INFO request for full frame refresh for devices be able to support an INFO message for full frame refresh for devices
that do not support RTCP mechanisms (please refer to Section 6.8). that do not support SRTCP (please refer to Section 6.1).
Implementations MUST support an in-dialog REFER (as described in Implementations MUST support an in-dialog REFER (as described in
[RFC3515] and updated by [RFC7647], and including support for [RFC3515] and updated by [RFC7647], and including support for
norefersub per [RFC4488]) with the Replaces header field [RFC3891] to norefersub per [RFC4488]) with the Replaces header field [RFC3891] to
enable call transfer. enable call transfer.
5.4. URI Representation of Phone Numbers 5.4. URI Representation of Phone Numbers
SIP URIs constructed from non-URI sources (dial strings) and sent to SIP URIs constructed from non-URI sources (dial strings) and sent to
SIP proxies by the RUE MUST be represented as follows, depending on SIP proxies by the RUE MUST be represented as follows, depending on
whether they can be represented as an E.164 number. In this section, whether they can be represented as an E.164 number. In this section,
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