MP-118 and Trixbox Integration Success

After a couple of days tinkering I finally got my Audiocodes MP-118 working with TrixBox 2.2, the most difficult part was the split nature of trixbox trunks. Sometimes a trunk can be both inbound and outbound at the same time, I fail to see the need to constantly separate them into two contexts, at any rate, here's my successful config:

Background: MP-118 is a 4 port FXS and 4 port FXO gateway. I wanted to get the FXO ports to passthrough to Asterisk for Inbound calls, and I wanted all users to be able to dial 9 to get outbound lines for outbound calls. I chose the MP-118 due to some echo and timing issues with Zaptel cards. I'm using a Rhino Ceros chassis as the Trixbox server, mainly because this site will probably upgrade to a PRI in the future.

Goals:
1. Get the 4 FXS ports operational as analog extensions
2. Get the 4 FXO ports working in both inbound and outbound calling scenarios
3. Get the SIP phones(Polycom 501/330) to be able to dial outbound with little to no echo(preferrably the latter).

Untested:
1. Caller ID inbound from the analog lines
2. MWI on the FXS ports

Procedure:
1. Trixbox setup
A. Setup extensions for each FXS port as SIP extensions. They are all setup as generic SIP devices. My only change was to disable voicemail for each of these extensions.
B. Setup Trunks for the group of Outbound lines. I accepted all Trixbox defaults, changing only the number of channels to four(to match my 4 FXO ports). My User Context was my main Phone number(I have a 4 line HUNT from AT&T). All calls can be identified this way.
C. Setup outbound routes. I setup two routes, one for 9+011, this trunk requires a passcode so that international dialing can be restricted. The second route is 9|. to match all calls outbound. Both routes are assigned my new trunk(I named it PSTN).
D. Setup inbound routes. I setup an IVR as the default for all incoming DID all incoming CID(I left everything blank at the top).
E. Everything else was standard trixbox setup, there's too many options to go into here.
2. MP-118 Setup
A. Quick Setup. Working with Proxy: Yes, Proxy IP: **TRIXBOX IP**, Proxy Name: blank, Enable Registration: Yes
B. Protocol Management
i. Protocol Definition->General. Channel Select Mode: Descending
ii. Protocol Definition->Proxy & Registration. Enable Proxy: Use proxy, Proxy IP Address: , Enable Registration: Enable, Registrar IP Address: **TRIXBOX IP**, Password: , Authentication Mode: Per Endpoint
iii. Protocol Definition->Coders. G.729, G.711U, G.711A, G723.1
iv. Protocol Definition->DTMF and Dialing. Max Digits: 32
v. Endpoint Phone Numbers. For each of the FXS ports, put one of the 4 extensions created in Trixbox. For the FXO ports since I have only one Trunk group in Trixbox I put the main number of my HUNT group for all 4 ports.
vi. Endpoint Settings->Authentication. For the FXS ports, put the Extensions you listed in step v.(also the extensions setup in Trixbox). For the FXO ports leave it blank(it will use the phone number from step v.)
vii. Endpoint Settings->Automatic Dialing. This was the last and most difficult part to figure out, for the FXS ports leave them blank(unless you want them to autodial something). For the FXO ports ***PUT THE IP ADDRESS OF THE TRIXBOX***. This is documented nowhere, and I just tried it on a hunch.
viii. Endpoint Settings->Caller ID. For the FXS ports put each Extension as the CLID(or name, if you don't mind updating everytime someone changes extension). for the FXO ports put each analog lines unique number. It will then identify the line the call came in on.
viv. Advanced Applications->FXO Settings. Dialing Mode: One Stage. Time to wait before dialing: 400

That's all I had to do to get it working. The MP-118 is one powerful little box, but damn confusing to setup. If anyone finds issues with what I've done please post as it'll only help me in the long run. Oh, and don't forget to Burn your Config in the MP-118 when you get it done testing, otherwise a power failure will set it back to factory.