Hi,I have spa9000 + spa400 + spa941 (102)  +spa942 (101) + pap2 (109 on phone1 port) and works ok !!!I connect fax machine on pap2 (109 ext).On spa400 I connected 4 ground lines.How can I do, when I make call from 109 (pap2) take from spa400 ground  ...