remove default-switch@ juniper EX2300 snmp trap

Hi, 

I'm trying to use trap on SVC-COR-EX23-24T with an other equipment. 

No matter which community I use, the EX2300 add in the trap : default-switch@communityname

The equipment in charge to receive the trap can't detect the @. How to remove it in the trap sent by the equipment?

see below config for trap.

Admin@NAME-EX2300-VSAT# show
location NAME-LOCAL;
contact COMPANY;
client-list COMPANY {
10.2.24.10/32;
}
community public {
authorization read-only;
}
community private {
authorization read-write;
}
trap-options;
trap-group COMPANY {
version v2;
targets {
10.2.24.10;
10.2.24.215;
}
}
trap-group public {
version v1;
targets {
10.2.24.10;
10.2.24.115;
10.2.24.215;
}
}

Thank you,

Best regards