Calls from FreePBX flow to only first SIP trunk of gateway

Hello! I have VS-GW1600-20G operated by FreePBX for outbound calls
Device: VS-GGU-E2M0400
Software Version: 2.0.5
Hardware Version: Date 2012-11-09 FPGA 11 Hardware 00

At the gateway I've created 2 sip trunks (SIP endpoints type 'server' ), 2 GSM groups and simple routes SIP_trunk--->GSM_group. All trunks are registered and fully functional, but calls from FreePBX flow to only first trunk (and first gsm group respectively). PBX logs show the call goes out right by the second trunk, but somehow jumps to the first at the gateway side.

Help, pls.

i] Last edited by Louie at 2014-5-9 01:58 [/i

HI,

Please contact me when you available,i will check it for you!
My contact info be shown as below:
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Skype: rick.zhu3

Best Regards.

Thank you very much for a prompt support.
I had to add "fromuser" option at the PBX side for trunks to be recognised by GSM gateway.
Now PBX outbound routes flow to correct gateway groups with the minimal below trunk config:
host=
username=
secret=
fromuser=
type=peer
disallow=all
allow=alaw&ulaw&gsm