How to create a VGSM trunk

Hello everybody,

I have installed a Voismart VGSM-II card on a PC running trixbox.
Internal calls work, but we have some problems with external calls.
Could you please tell me how to create the trunk?
Have I to create a custom trunk?
Which is the correct “Custom Dial String” I have to use?

This is my vgsm.conf:

[general]
sms_spooler = /usr/lib/asterisk/sms_spooler
sms_spooler_pars = -it

[me:*]
sms_sender_domain = sms.null.it
sms_recipient_address = SMS Router
dtmf_quelch = false
dtmf_mutemax = false
dtmf_relax = false
operator_selection = auto
operator_id =

[me:me0]
device = /dev/vgsm2_me0
mesim_device = /dev/vgsm2_mesim0
context = vgsm_in
sim_proto = local
sim_local_device_filename = /dev/vgsm2_sim0

[me:me1]
device = /dev/vgsm2_me1
mesim_device = /dev/vgsm2_mesim1
context = vgsm_in
sim_proto = local
sim_local_device_filename = /dev/vgsm2_sim1

[me:me2]
device = /dev/vgsm2_me2
mesim_device = /dev/vgsm2_mesim2
context = vgsm_in
sim_proto = local
sim_local_device_filename = /dev/vgsm2_sim2

[me:me3]
device = /dev/vgsm2_me3
mesim_device = /dev/vgsm2_mesim3
context = vgsm_in
sim_proto = local
sim_local_device_filename = /dev/vgsm2_sim3

Thanks for any help!