Calling multiple devices at the same time will lose the connection

[MikasaGitHub]

Hello, I currently have two devices, quectel0 and quectel1. When I use one device to make a call, the other party can connect and talk. I keep the first call alive. If I use the second device to call another person at this time, the two devices will lose connection.
When using quectel show devices, both devices cannot be found. I don’t know why. Looking forward to your reply.

[IchthysMaranatha]

I have not tested with multiple devices, but there have been others who have used multiple devices without this particular problem in the discussions. My guess would be a power issue, your equipment may not be able to provide power to both devices operating together.

[MikasaGitHub]

Thanks for your reply, I'm using a Raspberry Pi. I will verify this reason later.