Is the 7914 IP Phone Expansion Module the only one that exist?, or is there other with more buttons?
Thanks in advance
There is no choice for expansion module other than 2 x 7914 on an 8 buttons phone.
For larger needs cisco recommends you use Attendant Console on a PC. I understand that some customers may not like this, unfortunately no other alternative is available.
Hope this helps, please rate post if it does!