It sounds to me like the two-line phone or the phone cords are either defective, or mis-configured. This should have nothing at all to do with your service provider (Google Voice in this case).
Basic (USA) telephone wiring concepts:
Single line telephones and telephone cords use only the two center pins on the RJ-11 phone jacks. In a typical 4-wire phone cord, these center pins are electrically connected to the red and green wires in the cord.
Two-line telephones use the center pair of pins for line one, and the outer pair of pins for line two. In a typical 4-wire phone cord, the outer pair of pins are electrically connected to the yellow and black wires. This is known as a RJ-14 jack.
Two-line telephones usually have two different female phone jacks:
- One phone jack is labeled "L1/L2" or "L1+L2" or similar. This is a two-line, RJ-14 jack, with all four conductors in use.
- The other jack is labeled "L2". It is only using the center two pins, but these pins are electrically wired to Line 2 inside the phone.
The reason for this is:
- If you have a wall jack, or in this case, an OBi 202, that also has a two-line, four-conductor RJ-14 jack then you would connect a four-conductor telephone cord between the telephone and the OBi or wall jack, and you would be electrically connected to both phone lines...no need for the other cord.
- If you had two different, single-line RJ-11 phone jacks, for two different telephone service lines, then you'd need two cords: one two-conductor cord for L1, and a second two-conductor cord for L2. It's critical to understand that, in this scenario, you are NOT using the outer two conductors of the cords, and in fact, if you miswired it, you could be feeding line 2 into line 1 by mistake.
The OBi 202 has two female jacks: a L1+L2 RJ-14 jack, and a L2-only RJ-11 jack. The
outer two pins on the first jack are electrically connected to the
inner two pins on the second jack. This is essential to understand.
SO: the proper way to use a two-line telephone with a two-line OBi 202, is to connect the RJ-14 jack on the OBi to the RJ-14 jack on the telephone, using a four-conductor, four-pin telephone cord. Look carefully at the ends of your telephone cord's plastic phone jacks. If you see four wires connected to four gold pins, it's a four-conductor cord. If only the two center gold pins are present, it won't work.
Alternatively, you could use two, two-conductor phone cords between the two jacks on the OBi to the two jacks on the phone, but you'd need to carefully examine the switches on the bottom or sides of the phone to see if there's a switch that changes the wiring of those jacks.
The methodical, fool-proof way to troubleshoot this is to use some other, single-line telephone with a two-wire, two-pin RJ-11 phone cord. Plug it into one of the OBi jacks, test for dial tone, then repeat on the other phone jack.
Note: don't follow azrobert's advice to restore your OBi device's configuration before testing. If you have some sort of configuration error on your device, it'll just be restored along with the rest of the configuration. Instead, you should be able to test the device using only the OBiTALK service (assuming OBiTALK isn't offline, as it tends to be on weekends or other random, inconvenient periods).
The correct way to set up Google Voice on each of the two service provider configuration slots is detailed in my post, here:
http://www.obitalk.com/forum/index.php?topic=8560.msg56460#msg56460