I'm not sure if this is an option for you, but I use Sipura 3000 (FXO, FXS) and I don't have any problems with zaptel mess up in LMCE or Pluto.
I had a look at that sipura 3000. Looks like that takes the pstn pots and hand off ethernet back to the internal network. Is that correct?
If so, I don't think that requires the zaptel driver and uses SIP instead. PLEASE.. correct me if i"m wrong..
I havent had a chance to play with the telephony features in LMCE, but I plan on testing zap channels using the AMP config pages. I did have zaptel working with Pluto before switching to LMCE, but that required building zaptel myself. Anyway, I need to poke at this a bit more and see what I can find out.
BTW.. How well does that sipura 3000 work with connecting your pstn service. Do you have any issues with it?
Sipura has 1 FXO (for connection to your line) and 1 FXS (connect to your phone). You can separate those two interfaces, so FXO is incoming SIP trunk and FXS is outgoing SIP trunk.
I've used Sipura 3000 till know in my home setup (doorphone on FXS and GSM gateway on FXO) and had no problems - but this is not a typical setup. So I cannot give you real experience on Sipura 3000. AFAIK it allows a lot of settings and users have minimal complaints. Maybe you try to search for some more meaningful user experiences..
On new LMCE setup, I'll connect to analog line coming from IP VOIP gateway, so will start using SIpura in real environment.
One thing is for sure about Sipura: it has a lot of settings - nice for experienced users, but night mare for newbies...http://asterisk.pbx.in/voip-info/wiki/index3fdf44dd4b3e59556fdc9d58ce32ef25.html?comment_page=2&page_id=1288&maxComments=10&comments_maxComments=10&comments_sort_mode=commentDate_desc&comments_style=flat
BTW, 3000 model is now replaced with 3102... but only with slight differences...