Ring Zen, and ask them to carry out a CIDT test.
Yes the crimps look grotty, and maybe even a spot of corrosion visible on the A leg (orange) about half an inch back from the crimp. This may not be the cause of your issue though, theres a fair bit more copper between you and the exchange !
If the CIDT test passes, who provides the voice service ? Ring them, sound 'blonde' and tell them you are concerned about exposed wires on your eaves, they could be dangerous !