SIP 100 Trying vs 436 Bad Identity-Info
SIP 100 (Trying) is a 1xx Provisional response, while 436 (Bad Identity-Info) is a 4xx Client 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, 436 means that the Identity-Info header contains a URI that the server cannot dereference to obtain the signing certificate.
विवरण
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.
जब आप इसे देखें
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.
कैसे ठीक करें
No fix needed — this is normal call setup behavior. If stuck on 100 Trying for too long, check network connectivity and proxy configuration.
विवरण
The Identity-Info header contains a URI that the server cannot dereference to obtain the signing certificate.
जब आप इसे देखें
When the Identity-Info URI in the request points to an unreachable or invalid certificate location.
कैसे ठीक करें
Ensure the Identity-Info URI is reachable and points to a valid certificate. Check DNS resolution and TLS configuration.
मुख्य अंतर
100 is a 1xx Provisional response, while 436 is a 4xx Client 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 436: The Identity-Info header contains a URI that the server cannot dereference to obtain the signing certificate.
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 436 when when the Identity-Info URI in the request points to an unreachable or invalid certificate location.
कब किसका उपयोग करें
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 436 (Bad Identity-Info): Ensure the Identity-Info URI is reachable and points to a valid certificate. Check DNS resolution and TLS configuration.