1.GSM Call established or being established

Case A: Established GSM Call, Loop call is received

- In case there is an ongoing call on the GSM dialer while an incoming Loop call is received, the GSM call will be put on hold and the Loop call continues (ringing) until the Loop call is accepted or rejected.

- If Loop finishes the call, the dialer will NOT resume automatically the GSM call (it will be still on hold). 

- If the user resumes the GSM call manually before Loop call finishes, Loop call will be put on hold (see case D).

NOTE: If the dialer is handling multiple calls at the same time (one active call one on hold), there is no way to put all them on hold, so Loop will not progress with the call and will notify the user about that.

Case B: Established GSM Call, user starts a Loop call

- During an ongoing GSM, user tries to start a Loop Call, GSM call will be put on hold automatically. (same as case A) 

Case C: GSM Call being established, Loop call is answered and GSM call is established afterwards

- If during the establishing process of a GSM call (either incoming or outgoing) a Loop call is received and answered, Loop call will be established. If the user completes afterwards the establishment of the GSM call, Loop call will be put on hold.  

2. Loop Call established or being established

Case D: Established Loop call, GSM call is received

- If during an ongoing Loop call, an incoming GSM call is received, the Loop call will be put on hold and the GSM continues (ringing) until the GSM call is accepted or rejected.

- If the GSM call is finished, Loop call will NOT be automatically resumed(it will be still on hold). 

- If user resumes the Loop call manually before the GSM one finishes, dialer call will be put on hold (see case A). 

Case E: Established Loop Call, user starts a GSM Call

- During an ongoing Loop call, user tries to start a GSM Call, Loop call will be put on hold automatically (same as case D)

Case F: Loop Call being established, GSM call is answered and Loop call is established afterwards

- If during the establishing process of a Loop call (either incoming or outgoing) a GSM call is received and answered, GSM call will be established. If the user completes afterwards the establishment of the Loop call, GSM call will be put on hold.