---
title: "Check a Credential Connection Registration Status"
method: POST
path: "/credential_connections/{id}/actions/check_registration_status"
tags: ["Credential Connections"]
---

# Check a Credential Connection Registration Status

`POST /credential_connections/{id}/actions/check_registration_status`

Returns the live SIP registration status for a credential connection. Reports whether the endpoint is currently registered (`status`) and the timestamp of the last SIP registration event (`last_registration`).

## Path parameters

- `id` string, required

## Response `200`

Successful response with details about a credential connection registration status.

- object
  - `data` object
    - `record_type` string — Identifies the type of the resource.
    - `status` 'Not Applicable' | 'Not Registered' | 'Failed' | 'Expired' | 'Registered' | 'Unregistered' — The current registration status of your SIP connection
    - `sip_username` string, nullable — The user name of the SIP connection
    - `ip_address` string, nullable — The ip used during the SIP connection
    - `transport` string, nullable — The protocol of the SIP connection
    - `port` integer, nullable — The port of the SIP connection
    - `user_agent` string, nullable — The user agent of the SIP connection
    - `last_registration` string, nullable — ISO 8601 formatted date indicating when the resource was last updated.

## Other responses

- `400` — Bad request, the request was unacceptable, often due to missing a required parameter.
- `401` — Unauthorized
- `403` — The user doesn't have the required permissions to perform the requested action.
- `404` — The requested resource doesn't exist.

## Changes

> 93 revisions in range; 1 not diffed.

- **2026-09-16** `a6a61a29ecdd` — 6 breaking
  - the response property `data/ip_address` became nullable for the status `200`
  - the response property `data/last_registration` became nullable for the status `200`
  - the response property `data/port` became nullable for the status `200`
  - the response property `data/sip_username` became nullable for the status `200`
  - …2 more

[Change history](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/changes/credential_connections/:id/actions/check_registration_status/post.md)

---

[API](https://skmtc.dev/team-telnyx/apis/telnyx-api-2.md) · [All operations](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/llms.txt) · [OpenAPI document](https://skmtc.dev/team-telnyx/apis/telnyx-api-2/revisions/88481995b4ca?raw)