FYI IAX phone callgroup/pickupgroup

[Kennybell]

PBX in a Flash PURPLE Status
------------------------------------------------------------------------------
+------------------------System Information---------------------------+
¦ Asterisk = ONLINE | Dahdi = ONLINE | MySQL = ONLINE ¦
¦ SSH = ONLINE | Apache = ONLINE | Iptables = ONLINE ¦
¦ Fail2ban = ONLINE | Internet = ONLINE | Ip6Tables = ONLINE ¦
¦ BlueTooth = OFFLINE | Hidd = OFFLINE | NTPD = ONLINE ¦
¦ SendMail = ONLINE | Samba = OFFLINE | Webmin = ONLINE ¦
¦ Ethernet0 = ONLINE | Ethernet1 = N/A | Wlan0 = N/A ¦
¦ ¦
¦ PBX in a Flash Version = 1.7.5.6 Running on *HARDWARE* ¦
¦ FreePBX Version = 2.8.1.4 ¦

¦ Running Asterisk Version = 1.8.7.2 ¦
¦ Asterisk Source Version = 1.8.7.2 ¦
¦ Dahdi Source Version = 2.5.0.2+2.5.0.2 ¦
¦ Libpri Source Version = 1.4.12 ¦
¦ IP Address = 192.168.XX.XX on eth0 ¦
¦ Operating System = CentOS release 5.7 (Final) ¦
¦ Kernel Version = 2.6.18-238.9.1.el5 - 32 Bit ¦
¦ ¦
+---------------------------------------------------------------------+

I installed an IAX2 phone on my Android and so far seems okay. One issue I have is
where do I specify where to set callgroup & pickupgroup in my system for that ext?
Does anyone know the answer to this?