Ricoh 1515F fax trouble recieving

[copyaction]

Customer has phone service through there cable company.
2nd Ricoh 1515F machine I brought out to them will not recieve occasionally.
Both machines work fine in my office.
Any settings that can be changed to make it more compatible with cable phone service?

I should add, they hooked up a cheap Brother fax and of course it works fine!

[Venom]

in fax bit switches change:
(SWCOM) 00 to 01100000, 01 to 00000000
(SWG3) 03 to 01000010, 05 to 00000110, 06 to 01010110, 07 to 00011111

[copyaction]

in fax bit switches change:
(SWCOM) 00 to 01100000, 01 to 00000000
(SWG3) 03 to 01000010, 05 to 00000110, 06 to 01010110, 07 to 00011111

is that in SP mode?
104 communication sw
105 G3-1 sw

[Venom]

is that in SP mode?
104 communication sw
105 G3-1 sw

Yes Sir

[copyaction]

Yes Sir

many thanks, I will try it