diff --git a/CHANGELOG.md b/CHANGELOG.md
index dffd84e..db59699 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -79,6 +79,23 @@ tool does not recognize the token and cannot expand the template.
   guarantees, session lifecycle, and the internal shape of `session`
   beyond `session_id` and `lang` are explicitly out of scope.
 
+## OVOS-SESSION-1 — Session Carrier Wire Shape
+
+### 1
+
+- The `context.session` carrier wire shape: the `session_id` and `lang`
+  core fields, the language field family (§3.2), the §2.1 field-registry
+  mechanism by which other specifications claim OPTIONAL session fields,
+  and the propagation and wire-weight rules.
+- §2.1 — registered fields and their owning specifications:
+  `converse_handlers` (OVOS-CONVERSE-1 §2.1), `fallback_handlers`
+  (OVOS-FALLBACK-1 §4), and `persona_id` (OVOS-PERSONA-1 §3).
+- §3.3 — `site_id` is defined by OVOS-BRIDGE-1 §3.3; this section states
+  the consumer constraints that apply within the orchestrator pipeline.
+- See also — each field's owning specification, including
+  `session.active_handlers` (OVOS-PIPELINE-1 §7.1) and
+  `session.converse_handlers` (OVOS-CONVERSE-1 §2.1).
+
 ## OVOS-INTENT-4 — Intent and Entity Registration Bus Contract
 
 ### 1
diff --git a/session-1.md b/session-1.md
index 54537ae..cb33108 100644
--- a/session-1.md
+++ b/session-1.md
@@ -193,7 +193,10 @@ session and persist across utterances.
 | `pipeline` | array of string | OVOS-PIPELINE-1 §5 |
 | `intent_context` | object | OVOS-CONTEXT-1 §2 |
 | `active_handlers` | array of object `{skill_id, activated_at, ...}` | OVOS-PIPELINE-1 §7.1 |
+| `converse_handlers` | array of object `{skill_id, activated_at}` | OVOS-CONVERSE-1 §2.1 |
 | `response_mode` | object `{skill_id, expires_at}` | OVOS-CONVERSE-1 §2.2 |
+| `fallback_handlers` | array of string | OVOS-FALLBACK-1 §4 |
+| `persona_id` | string | OVOS-PERSONA-1 §3 |
 | `audio_transformers` | array of string | OVOS-TRANSFORM-1 §5 |
 | `utterance_transformers` | array of string | OVOS-TRANSFORM-1 §5 |
 | `metadata_transformers` | array of string | OVOS-TRANSFORM-1 §5 |
@@ -209,7 +212,7 @@ session and persist across utterances.
 | `blacklisted_intent_transformers` | array of string | OVOS-TRANSFORM-1 §5.2 |
 | `blacklisted_dialog_transformers` | array of string | OVOS-TRANSFORM-1 §5.2 |
 | `blacklisted_tts_transformers` | array of string | OVOS-TRANSFORM-1 §5.2 |
-| `site_id` | string | §3.3 (this spec) |
+| `site_id` | string | OVOS-BRIDGE-1 §3.3 |
 
 Every field above is OPTIONAL on the wire. A producer that sets a
 field **MUST** use the wire type listed and the value space defined
@@ -465,31 +468,16 @@ A consumer that needs the payload's content language reads
 
 ### 3.3 `site_id`
 
-`site_id` is an **opaque group identifier** for the session. It
-names the group or physical location the session belongs to; the
-grouping criterion (physical site, room, device cluster,
-organisational unit, deployment tenant) is chosen by the deployer
-and is not fixed by this specification.
-
-The primary consumer is **routing and output-locality policy**: a
-component that routes audio, selects a TTS sink, or decides which
-device speaks **MAY** use `site_id` to scope its decision to the
-appropriate physical or logical group. A layer-2 system **MAY**
-enforce that sessions from a given `site_id` are served only by
-components registered to that site.
-
-Constraints:
-
-- **Opaque string.** A consumer **MUST NOT** parse or ascribe
-  structure to `site_id` beyond string equality.
-- **No reserved value.** Unlike `session_id`, no specific string
-  value carries spec-defined meaning. In particular, the value
-  `"unknown"` — a value some implementations use as a placeholder —
-  carries no normative meaning under this specification.
-- **Set by the session origin.** `site_id` SHOULD be populated by
-  the client or device that initiates the session, not by the
-  orchestrator. A component that forwards or derives a Message MUST
-  NOT overwrite an existing `site_id`.
+`site_id` is an opaque group identifier. Its full normative
+definition — assignment rules, bridge behaviour, and consumer
+constraints — is owned by **OVOS-BRIDGE-1 §3.3**. This section is
+a registry pointer only.
+
+Consumers of `site_id` within the orchestrator pipeline (audio
+routing, output-locality policy) **MAY** use it to scope decisions
+to a physical or logical group. They **MUST NOT** parse or ascribe
+structure beyond string equality, and **MUST NOT** overwrite a
+`site_id` already present on an inbound Message.
 
 ### 3.4 Wire weight
 
@@ -665,9 +653,13 @@ any field not claimed under §2.2 by a normative specification.
 - **OVOS-MSG-1** — defines `Message.context` as the carrier and the
   `forward` / `reply` / `response` derivations that propagate
   `session` unchanged.
-- **OVOS-PIPELINE-1** — owns `session.pipeline`.
+- **OVOS-PIPELINE-1** — owns `session.pipeline` and
+  `session.active_handlers`.
 - **OVOS-CONTEXT-1** — owns `session.intent_context`.
-- **OVOS-CONVERSE-1** — owns `session.active_handlers` and
+- **OVOS-CONVERSE-1** — owns `session.converse_handlers` and
   `session.response_mode`.
 - **OVOS-TRANSFORM-1** — owns the six `session.*_transformers`
   fields.
+- **OVOS-FALLBACK-1** — owns `session.fallback_handlers`.
+- **OVOS-PERSONA-1** — owns `session.persona_id`.
+- **OVOS-BRIDGE-1** — owns `session.site_id`.