When a fax is coming with the disable echo option in the zaptel configuration, all the services in the makine stops (asterisk, http, ssh, etc.). I notice this problem with the first version of HPEC, but I decide is a hardware problem and discard it.
Now I have a new server, pentium with dual processor, and only 3 FXO. Last week the system goes down and the only message before is the disable tone for fax.
Is anyone detects the same problem.
I disable the echo canceler option en zaptel and wait for results.