We deployed a PABX in China, orginally it used Netcom（网通）'s E1, the zaptel.conf is as following:
span=1,0,0,ccs,hdb3,crc4 bchan=1-15 bchan=17-31 dchan=16 loadzone=cn defaultzone=cn However, recently customer changed to use China Telecom（中国电信）'s E1, it always show REC, RED/REC, RED, cycling alarm when I run zttool in console. They sometimes still can make call, but the quality was quite bad. China Telecom's engineers already checked the cable using some E1 test tools, it works perfect, and they even plug E1 into a Panasonic PABX, it didn't have any quality problem. FYI, The card model is TE412P. -- Regards! Liangliang
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