Our 3CX system is connect with a Patton 4112 FX0 gateway. I have had pretty good luck calling local numbers out, but for some reason, I only can call 800 or 866 numbers about 50% of the time. Either the call goes through just fine or I receive the Telco's automated "We're sorry, we are unable to complete your call as dialed. Dial 1 or 0 first, then the area code and telephone number." message. On one of our 4 SPA-921 handsets, the success rate is probably 30-40% at most. Using the 3CX softphone, the call completion success rate is about 60-80%. Either option is a gamble at best. Originally I couldn't dial ANY toll-free numbers, but found our 3CX caller-ID field was blank. Putting in our correct phone number seemed to resolve before we encountered this issue. Anyone have any suggestion or might be able to point me in the right direction?? Thank you in advance!