GSM call keeps running with sip call ?

[harryandroiddev]

Issue: GSM Call and SIP Call Running in Parallel

We are facing an issue where a GSM call and a SIP call are running in parallel on the device.

Even after adding the READ_PHONE_STATE permission in the Android manifest and enabling telephony state listening using:

iniData.listenTelState = true;

the application is still allowing a SIP call to start while a GSM call is already active.

Expected Behavior:
When a GSM call is active (either outgoing or ongoing), the application should detect the phone state and prevent the SIP call from starting. Instead, it should show an error message indicating that another call is already in progress.

Actual Behavior:
Despite the permission being granted and telephony state listening enabled, the SIP call can still be initiated while the GSM call is active, resulting in both calls running simultaneously.

Steps to Reproduce:

1. Start an outgoing GSM call.
2. While the GSM call is active, attempt to start a SIP call from the application.
3. The SIP call starts successfully instead of being blocked.

Environment:

• Platform: Android
• Permission added: READ_PHONE_STATE
• Telephony state listening enabled: iniData.listenTelState = true

Please investigate why the telephony state is not preventing the SIP call when a GSM call is already in progress.

[siprix]

why the telephony state is not preventing the SIP call when a GSM call is already in progress.

Because it's not implemented in that way.
Current implementation just holds/unholds existing SIP calls when GSM call's state changed to Offhook/Idle.

When user decided to initiate new SIP call while GSM is in progress - it's deliberate decision, unless app displays UI which doesn't look as real call.
It's possible to modify implementation and disable ability to initiate call in that case.