Got my Obihai 110 this weekend and wanted to configure it to use pstn for local calls and Google Voice for long distance. I found lots of good tutorials for setting up GV, but was surprised by the lack of a step-by-step for routing only long distance through GV. Maybe most people are dumping their land lines entirely?
After spending a few hours reading the forum and docs, I had a working config. I thought my notes might be helpful to someone else. Feel free to tell me if there are better ways to accomplish this.
1) Configure sp1 and/or sp2 using the wizard or available tutorials. Make sure you can call out using **1 and/or **2
2) Set 'Physical Interfaces->PHONE Port->PrimaryLine' to PSTN line
3) In 'Settings->User Defined Digit Maps' add a new user digit map called ld2tg4 that looks like this: (<**4>1xxxxxxxxxx|<**4>011xx.)
4) In 'Physical Interfaces->LINE Port->DigitMap' add |(Mld2tg4)
5) In 'Voice Services->Gateways and Trunk Groups' add trunk group 4 named sp1_sp2_li defined as sp1,sp2,li with DigitMap (1xxxxxxxxxx|<1>[2-9]xxxxxxxxx|011xx.|xx.|(Mipd)|[^*]@@.)
4) In 'Physical Interfaces->PHONE Port->OutboundCallRoute' add |{(<**4:>(Mtg4)):tg4}
This adds **4 to the front of any dialed 1+10 digit number or 011+number and defines **4 as the trunk group 4 prefix which will search sp1, sp2, and line for an available trunk. You can leave off sp2 and/or li as needed for your configuration.
I think you could add the Mld2tg4 digit map to sp1, sp2, and li so no changes would need to be made if you change PrimaryLine but I didn't test that.
I just copied the default digit map from sp1 as the tg4 digit map. I think you could use the (Msp1) digit map reference, but I copied it in case I wanted to change one of them later and not affect the other.
There are definitely easier ways to accomplish this task, but I like the modularity of user defined digit maps and the configurability of trunk groups.
