> ## Documentation Index
> Fetch the complete documentation index at: https://docs.telli.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Kontakt aktualisieren

> Updates an existing contact. Only provided fields will be updated, others remain unchanged.

<Warning>
  Dieser Endpunkt ist veraltet. Verwende stattdessen [Kontakt aktualisieren](/de/v2/endpoint/update-contact). Weitere Informationen findest du in der [Migrationsanleitung](/de/v2-migration-guide).
</Warning>


## OpenAPI

````yaml openapi.json PATCH /v1/update-contact
openapi: 3.0.3
info:
  title: telli API
  version: 1.0.0
  description: API documentation for telli's V1 endpoints
servers:
  - url: https://api.telli.com
security:
  - apiKey: []
paths:
  /v1/update-contact:
    patch:
      summary: Update Contact
      description: >-
        Updates an existing contact. Only provided fields will be updated,
        others remain unchanged.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - contact_id
              properties:
                contact_id:
                  type: string
                  format: uuid
                  description: The telli contact ID received when creating the contact
                first_name:
                  type: string
                  description: First name of the contact
                last_name:
                  type: string
                  description: Last name of the contact
                phone_number:
                  type: string
                  description: Contact's phone number in E.164 format (e.g. +4917642048466)
                contact_details:
                  type: object
                  description: >-
                    Custom variables passed to the AI agent. The entire object
                    will be overwritten. This used to be called
                    dynamic_variables, which still works but is deprecated and
                    should be replaced with contact_details.
                salutation:
                  type: string
                  description: Formal title or greeting (e.g. 'Mr.', 'Ms.', 'Herr', 'Frau')
                email:
                  type: string
                  format: email
                  description: Contact's email address
                timezone:
                  type: string
                  description: IANA timezone identifier (e.g. Europe/Berlin)
                external_contact_id:
                  type: string
                  description: Your unique internal identifier for the contact
                external_url:
                  type: string
                  format: uri
                  description: >-
                    External URL linking to the contact in your CRM or external
                    system
      responses:
        '200':
          description: Contact updated successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  contact_id:
                    type: string
                    format: uuid
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Error:
      type: object
      properties:
        message:
          type: string
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: Authorization
      description: 'API key must be provided as: Bearer <api_key>'
      x-bearer-format: Bearer

````