System.conf:

loadzone=us
defaultzone=us

#Sangoma A101 port 1 [slot:0 bus:5 span:1] <wanpipe1>
span=1,1,0,cas,hdb3
cas=1-15:1101
#dchan=16
cas=17-31:1101
echocanceller=mg2,1-15,17-31


Dahdi-Channels.conf

;Sangoma A102 port 1 [slot:3 bus:7 span:1] <wanpipe1>
context=from-pstn
group=3
signalling=mfcr2
mfcr2_variant=ve
mfcr2_get_ani_first=yes
mfcr2_max_ani=11
mfcr2_max_dnis=3
mfcr2_category=national_subscriber
mfcr2_logdir=log
mfcr2_logging=all
channel => 1-15
channel => 17-31

Versiones:
	Asterisk 1.8.11
	Dahdi 2.4.1.2
	OpenR2 1.3.1