I have an Asterisk system that seems to be randomly dropping calls. The system is currently running on a Junghanns octo-bri card and one Digium TDM400b card. The calls seem to be dropped during peak call hours and I assume that it probably has something to do with congestion (this box makes/receives about 2500 calls a day). I added the zapata and zaptel confgurations that I am using below: #####zapata.conf##### [channels] group = 1 echocancel = yes signalling = fxs_ks language = en context = default overlapdial = yes immediate = no channel => 25-27 group = 2 echocancel = yes switchtype = euroisdn signalling = bri_cpe_ptmp overlapdial = yes immediate = no pridialplan = local prilocaldialplan = local nationalprefix = 0 internationalprefix = 00 context = default ; S/T port 1 channel => 1-2,4-5,7-8,10-11,13-14,16-17,19-20,22-23 #######zaptel.conf###### loadzone=nl defaultzone=nl # qozap span definitions # most of the values should be bogus because we are not really zaptel span=1,1,3,ccs,ami span=2,0,3,ccs,ami span=3,0,3,ccs,ami span=4,0,3,ccs,ami span=5,1,3,ccs,ami span=6,0,3,ccs,ami span=7,0,3,ccs,ami span=8,0,3,ccs,ami bchan=1,2 dchan=3 bchan=4,5 dchan=6 bchan=7,8 dchan=9 bchan=10,11 dchan=12 bchan=13,14 dchan=15 bchan=16,17 dchan=18 bchan=19,20 dchan=21 bchan=22,23 dchan=24 Any help greatly appreciated.