Calling many SIPs at a time

Asterisk Asterisk Support
1

Hi,
I have two soft phones connected to my asterisk.They have the same username.And I want to ring them together when a user dial an extension.Is it possible?And if yes is it called sip trunking?How can i do it?
softphone1:username=1000abc
softphone2:username=1000abc

sip.conf

[1000abc] type=peer externip=117.200.236.236 localnet=192.168.1.8/255.255.255.0 nat=yes qualify=no allow=all udpbindaddr=0.0.0.0 bindaddr=0.0.0.0 secret=mysecret host=dynamic context=incoming-call

2

You will need to make the resource names different, or use static addresses.

externip should be in general.

You use the & in the Dial application dial string, to dial multiple devices as one extension.