1. Two SIP phones can login to FWD at the same time with the same username/pwd , is this normal?
Ed explained this.
2. can Two SIP phones login to * at the same time with the same username/pwd ? how to prevent this?
Well, a SIP proxy normally allows this. Asterisk is not a SIP proxy by design, it's a PBX. As a multi-protocol PBX, the design is quite different and sometimes there has to be compromises to make functions work cross- channels, to use Asterisk terminology.
One of these is that we only handle one SIP registration per SIP peer/user. If you want several phones to ring on one extension, this is defined in the dialplan, not on a SIP level. Otherwise, the PBX core wouldn't really know how many phones that where ringing and what happened out there.
If you configure two phones to register with Asterisk using the same SIP account, you will see that the IP address of that SIP peer will change now and then.
There will be no error message when phone #2 registers, only the last registration is valid.
Maybe we should * Add a warning if a re-registration for a SIP account changes IP address
/O
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