ooma uses "partners" to connect to the PSTN (public switched telephone network). Some time ago after taking a 2 day vacation, I was getting a message, "A call from this phone number is invalid. Please call nexlink customer service for assistance. Seattle 58." then the call would connect. Turns out that it was a problem with XO communications, one of ooma's partners. After I informed technical support of the problem, it was taken care of. We had a false start, but I have not had the message in months.
My suggestion is to document when this is happening and the number dialed. Also if it connects or not. Then call 888 711-6662 with the information. They will research if it is a routing problem or a "partner" issue and take care of it from their end.
And lest I forget, welcome to ooma! I think you will enjoy your system and will also find this forum to be a great source of information. There are a lot of very helpful people who frequent here. Your experiences will help other users, so don't be a stranger.
ooma customer since February 2009
VoIP hardware: Telo w/3 handsets & Linx / ooma core
Total Lines: 6 / Numbers: 10 / Handsets: 20
Lifetime Premier Member
Friends don't remember what Landline Integration was or why we did it.