Request for Comments: 5478
Category: Standards Track
IANA Registration of New Session Initiation Protocol (SIP)
Status of This Memo
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This document creates additional Session Initiation Protocol (SIP) Resource-Priority namespaces to meet the requirements of the US Defense Information Systems Agency, and places these namespaces in the IANA registry.
Table of Contents
1. Introduction ....................................................2 1.1. Conventions Used in This Document ..........................3 2. New SIP Resource-Priority Namespaces Created ....................3 3. IANA Considerations .............................................4 3.1. IANA Resource-Priority Namespace Registration ..............4 3.2. IANA Priority-Value Registrations ..........................6 4. Security Considerations .........................................6 5. Acknowledgments .................................................6 6. Normative References ............................................6
The US Defense Information Systems Agency (DISA) is rolling out their Session Initiation Protocol (SIP) based architecture at this time. This network will require more Resource-Priority namespaces than were defined, and IANA registered, in RFC 4412 [RFC4412]. The purpose of this document is to define these additional namespaces. Each will be preemptive in nature, as defined in RFC 4412, and will have the same 10 priority-values.
DISA has a requirement to be able to assign different Resource- Priority namespaces to differing groups of differing sizes throughout their networks. Examples of this may be
- namespaces as large as each branch of service (Army, Navy, Air Force, Marines, Coast Guard)
- namespaces for some departments within the government (for example, Homeland Security)
- namespaces that are temporary assignments to individual units of varying sizes (from battle groups to patrol groups or platoons)
These temporary assignments might be combinations of smaller units involving several branches of service operating as one unit (say, one task force, which is separate than the branch of service), or a single commando unit requiring special treatment for a short period of time, making it appear separate from the branch of service they are from.
Providing DISA with a pool of namespaces for fine-grained assignment(s) allows them the flexibility they need for their mission requirements. One can imagine due to their sheer size and separation of purpose, they can easily utilize a significant number of namespaces within their networks. This is the reason for the assignment of so many new namespaces, which seems to deviate from guidance in RFC 4412 to have as few namespaces as possible.
This document makes no changes to SIP, it just adds IANA-registered namespaces for SIP's use within the Resource-Priority header framework.
1.1. Conventions Used in This Document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].
2. New SIP Resource-Priority Namespaces Created
The following 40 SIP namespaces are created by this document:
dsn-000000 drsn-000000 rts-000000 crts-000000 dsn-000001 drsn-000001 rts-000001 crts-000001 dsn-000002 drsn-000002 rts-000002 crts-000002 dsn-000003 drsn-000003 rts-000003 crts-000003 dsn-000004 drsn-000004 rts-000004 crts-000004 dsn-000005 drsn-000005 rts-000005 crts-000005 dsn-000006 drsn-000006 rts-000006 crts-000006 dsn-000007 drsn-000007 rts-000007 crts-000007 dsn-000008 drsn-000008 rts-000008 crts-000008 dsn-000009 drsn-000009 rts-000009 crts-000009
Each namespace listed above is wholly different. However, according to the rules within Section 8 of RFC 4412, one or more sets can be treated as if they are the same when they are configured as an aggregated grouping of namespaces.
These aggregates of two or more namespaces, that are to be considered equivalent during treatment, can be a set of any IANA registered namespaces, not just adjacent (i.e., consecutive) namespaces.
Each namespace listed above will have the same 10 priority levels:
.0 (lowest priority) .1 .2 .3 .4 .5 .6 .7 .8 .9 (highest priority)
According to the rules established in RFC 4412 [RFC4412], priority- values have a relative order for preferential treatment, unless one or more consecutive groups of priority-values are to be considered equivalent (i.e., first-received, first treated).
The dash character ('-') is just like any other ASCII character within a namespace, and is not to be considered a delimiter in any official way within any namespace here. Other namespace definitions in the future could change this.
As stated in Section 9 of RFC 4412 [RFC4412] an IANA-registered namespace SHOULD NOT change the number, and MUST NOT change the relative priority order, of its assigned priority-values.
3. IANA Considerations
Abiding by the rules established within RFC 4412 [RFC4412], this is a Standards-Track document registering new namespaces, their associated priority-values, and intended algorithms.
3.1. IANA Resource-Priority Namespace Registration
Within the "Resource-Priority Namespaces" registry in the sip- parameters section of IANA, the following table lists the new namespaces registered by this document.
Intended New warn- New resp. Namespace Levels Algorithm code code Reference ---------- ------ ------------ --------- --------- --------- dsn-000000 10 preemption no no [RFC5478] dsn-000001 10 preemption no no [RFC5478] dsn-000002 10 preemption no no [RFC5478] dsn-000003 10 preemption no no [RFC5478] dsn-000004 10 preemption no no [RFC5478] dsn-000005 10 preemption no no [RFC5478] dsn-000006 10 preemption no no [RFC5478] dsn-000007 10 preemption no no [RFC5478] dsn-000008 10 preemption no no [RFC5478] dsn-000009 10 preemption no no [RFC5478] drsn-000000 10 preemption no no [RFC5478] drsn-000001 10 preemption no no [RFC5478] drsn-000002 10 preemption no no [RFC5478] drsn-000003 10 preemption no no [RFC5478] drsn-000004 10 preemption no no [RFC5478] drsn-000005 10 preemption no no [RFC5478] drsn-000006 10 preemption no no [RFC5478] drsn-000007 10 preemption no no [RFC5478] drsn-000008 10 preemption no no [RFC5478] drsn-000009 10 preemption no no [RFC5478] rts-000000 10 preemption no no [RFC5478] rts-000001 10 preemption no no [RFC5478] rts-000002 10 preemption no no [RFC5478] rts-000003 10 preemption no no [RFC5478] rts-000004 10 preemption no no [RFC5478] rts-000005 10 preemption no no [RFC5478] rts-000006 10 preemption no no [RFC5478] rts-000007 10 preemption no no [RFC5478] rts-000008 10 preemption no no [RFC5478] rts-000009 10 preemption no no [RFC5478] crts-000000 10 preemption no no [RFC5478] crts-000001 10 preemption no no [RFC5478] crts-000002 10 preemption no no [RFC5478] crts-000003 10 preemption no no [RFC5478] crts-000004 10 preemption no no [RFC5478] crts-000005 10 preemption no no [RFC5478] crts-000006 10 preemption no no [RFC5478] crts-000007 10 preemption no no [RFC5478] crts-000008 10 preemption no no [RFC5478] crts-000009 10 preemption no no [RFC5478]
3.2. IANA Priority-Value Registrations
Within the "Resource-Priority Priority-values" registry in the sip-parameters section of IANA, the list of priority-values for each of the 40 newly created namespaces from Section 3.1 of this document, prioritized least to greatest, is registered by the following (replicated similar to the following format):
Namespace: dsn-000000 Reference: RFC5478 (this document) Priority-Values (least to greatest): "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"
4. Security Considerations
This document has the same Security Considerations as RFC 4412.
To Jeff Hewett for his helpful guidance in this effort. Thanks to Janet Gunn, John Rosenberg, Joel Halpern, Michael Giniger, Henning Schulzrinne, Keith Drage, and Suresh Krishnan for their comments.
6. Normative References
[RFC4412] Schulzrinne, H. and J. Polk, "Communications Resource Priority for the Session Initiation Protocol (SIP)", RFC 4412, February 2006. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
James Polk 3913 Treemont Circle Colleyville, Texas 76034 USA Phone: +1-817-271-3552 EMail: email@example.com