SIP 100 Trying vs 608 Rejected
SIP 100 (Trying) is a 1xx Provisional response, while 608 (Rejected) is a 6xx Global Failure response. 100 indicates that the request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses. In contrast, 608 means that an intermediary machine or process rejected the call attempt. Similar to 607 but the rejection comes from the network rather than the end user.
Описание
The request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses.
Когда вы это видите
Immediately after sending an INVITE. The proxy has received the call and is searching for the callee. This is the SIP equivalent of a dial tone.
Как исправить
No fix needed — this is normal call setup behavior. If stuck on 100 Trying for too long, check network connectivity and proxy configuration.
Описание
An intermediary machine or process rejected the call attempt. Similar to 607 but the rejection comes from the network rather than the end user.
Когда вы это видите
When a network element (not the callee) blocks the call. Used by analytics engines and call-blocking services in the network path.
Как исправить
This is a network-level block. Contact the network administrator or carrier to understand why the call was blocked.
Ключевые различия
100 is a 1xx Provisional response, while 608 is a 6xx Global Failure response.
SIP 100: The request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses.
SIP 608: An intermediary machine or process rejected the call attempt. Similar to 607 but the rejection comes from the network rather than the end user.
You encounter 100 when immediately after sending an INVITE. The proxy has received the call and is searching for the callee. This is the SIP equivalent of a dial tone.
You encounter 608 when when a network element (not the callee) blocks the call. Used by analytics engines and call-blocking services in the network path.
Когда что использовать
For 100 (Trying): No fix needed — this is normal call setup behavior. If stuck on 100 Trying for too long, check network connectivity and proxy configuration. For 608 (Rejected): This is a network-level block. Contact the network administrator or carrier to understand why the call was blocked.