Hi! Did anyone resolved the issue of unability to write to zaptel FD? It's still an issue. My latest LIVE test showed that it happens with any codecs, when asterisk call another asterisk with g711 the only requirements - that there must be several on-going live calls. And as more calls is on - that happens more and more often. Audialy that heared as ticks in the sound. I do use Sangoma A102 card. Apr 8 19:39:38 NOTICE[21974]: chan_ss7.c:1884 ss7_write: Write buffer full on CIC=29 (wrote only 0 of 160), audio lost. Apr 8 19:39:38 NOTICE[22014]: chan_ss7.c:1884 ss7_write: Write buffer full on CIC=11 (wrote only 0 of 160), audio lost.