We've received multiple complaints from our customers and have also experienced call quality issues ourselves when using the 3CX iOS and Android apps.
The issue isn't constant, but it occurs approximately 7 times out of 10. Internal calls work perfectly fine. However, during outbound calls through SIP trunks, we frequently receive complaints from the called party about noise on the line and difficulty hearing the caller clearly. Meanwhile, the caller can hear the called party loud and clear and the call quality indicator is green.
The issue occurs intermittently across multiple 3CX systems, all running the latest version and hosted on either Microsoft Azure or AWS. Most of these systems use the same SIP trunk provider but connect through different servers. However, we've also experienced the same issue with another SIP trunk provider (Twilio).
Interestingly, the issue only seems to affect calls made through the 3CX iOS and Android mobile apps. Calls made using desk phones, the Windows softphone, or the web client work perfectly fine.
I've already verified that the SIP trunk codecs are configured correctly and confirmed the settings with our VoIP trunk provider. We've also tried adjusting various settings, including "PBX Delivers Audio," enabling and disabling SRTP, and other user-level configurations, but nothing has resolved the issue.
Has anyone else experienced similar problems with the 3CX mobile apps? If so, were you able to identify the cause or find a solution?
The issue isn't constant, but it occurs approximately 7 times out of 10. Internal calls work perfectly fine. However, during outbound calls through SIP trunks, we frequently receive complaints from the called party about noise on the line and difficulty hearing the caller clearly. Meanwhile, the caller can hear the called party loud and clear and the call quality indicator is green.
The issue occurs intermittently across multiple 3CX systems, all running the latest version and hosted on either Microsoft Azure or AWS. Most of these systems use the same SIP trunk provider but connect through different servers. However, we've also experienced the same issue with another SIP trunk provider (Twilio).
Interestingly, the issue only seems to affect calls made through the 3CX iOS and Android mobile apps. Calls made using desk phones, the Windows softphone, or the web client work perfectly fine.
I've already verified that the SIP trunk codecs are configured correctly and confirmed the settings with our VoIP trunk provider. We've also tried adjusting various settings, including "PBX Delivers Audio," enabling and disabling SRTP, and other user-level configurations, but nothing has resolved the issue.
Has anyone else experienced similar problems with the 3CX mobile apps? If so, were you able to identify the cause or find a solution?
