SIP 300 Multiple Choices vs 420 Bad Extension
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 420 (Bad Extension) is a 4xx Client Failure response. 300 indicates that the address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint. In contrast, 420 means that the server did not understand the protocol extension specified in a Require or Proxy-Require header. The Unsupported header lists the unknown extensions.
الوصف
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
متى تراه
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
كيفية الإصلاح
Select one of the provided Contact addresses and resend the request to that specific URI.
الوصف
The server did not understand the protocol extension specified in a Require or Proxy-Require header. The Unsupported header lists the unknown extensions.
متى تراه
When the request includes a Require header with SIP extensions that the server does not support.
كيفية الإصلاح
Check the Unsupported header in the response. Remove the unsupported extension from the Require header or make it optional via Supported.
الفروق الرئيسية
300 is a 3xx Redirection response, while 420 is a 4xx Client Failure response.
SIP 300: The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
SIP 420: The server did not understand the protocol extension specified in a Require or Proxy-Require header. The Unsupported header lists the unknown extensions.
You encounter 300 when when a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
You encounter 420 when when the request includes a Require header with SIP extensions that the server does not support.
متى تستخدم أيًا منهما
For 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI. For 420 (Bad Extension): Check the Unsupported header in the response. Remove the unsupported extension from the Require header or make it optional via Supported.