SIP 180 Ringing vs 438 Invalid Identity Header
SIP 180 (Ringing) is a 1xx Provisional response, while 438 (Invalid Identity Header) is a 4xx Client Failure response. 180 indicates that the UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end. In contrast, 438 means that the server obtained the certificate from the Identity-Info header but the signature in the Identity header is invalid.
Açıklama
The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
Gördüğünüzde
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
Nasıl Düzeltilir
No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings.
Açıklama
The server obtained the certificate from the Identity-Info header but the signature in the Identity header is invalid.
Gördüğünüzde
When the cryptographic signature in the Identity header does not match the message content, indicating possible tampering.
Nasıl Düzeltilir
Regenerate the Identity header with a correct signature. Ensure no intermediary is modifying signed headers after signing.
Temel Farklar
180 is a 1xx Provisional response, while 438 is a 4xx Client Failure response.
SIP 180: The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
SIP 438: The server obtained the certificate from the Identity-Info header but the signature in the Identity header is invalid.
You encounter 180 when during call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
You encounter 438 when when the cryptographic signature in the Identity header does not match the message content, indicating possible tampering.
Hangisini Ne Zaman Kullanmalı
For 180 (Ringing): No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings. For 438 (Invalid Identity Header): Regenerate the Identity header with a correct signature. Ensure no intermediary is modifying signed headers after signing.