In Asterisk server
Step 1: Go to Applications > Extensions > Edit <extension> > Advanced
Note: Asterisk supports only MEDIAENCRYPTION 1 (aescm128-hmac80)
1.2.3 Transfer
Attended transfer and blind transfer is supported in J100 Series IP Phones.
1.2.4 Conference
Local conference
Local conference is supported in J100 Series IP Phones (without CONFERENCE_FACTORY_URI setting)
Meet me conference
Configure Meet me conference on Asterisk as below:
Step 1: Go to Applications > Conferences > Add