SIP 300 Multiple Choices vs 502 Bad Gateway
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 502 (Bad Gateway) is a 5xx Server 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, 502 means that the server, acting as a gateway or proxy, received an invalid response from a downstream server it accessed in attempting to fulfill the request.
Описание
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
Когда вы это видите
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
Как исправить
Select one of the provided Contact addresses and resend the request to that specific URI.
Описание
The server, acting as a gateway or proxy, received an invalid response from a downstream server it accessed in attempting to fulfill the request.
Когда вы это видите
When a SIP proxy receives a malformed or invalid response from the next-hop server. Common in interop scenarios between different vendors.
Как исправить
Check the downstream server's health and configuration. Verify SIP message formatting between the two servers. Review network connectivity.
Ключевые различия
300 is a 3xx Redirection response, while 502 is a 5xx Server 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 502: The server, acting as a gateway or proxy, received an invalid response from a downstream server it accessed in attempting to fulfill the request.
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 502 when when a SIP proxy receives a malformed or invalid response from the next-hop server. Common in interop scenarios between different vendors.
Когда что использовать
For 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI. For 502 (Bad Gateway): Check the downstream server's health and configuration. Verify SIP message formatting between the two servers. Review network connectivity.