OP here. I can assure you all that there is nothing more than her calling to chit chat about work. She is very much an extrovert. She is not lonely, doesn’t have anything horrible going on in her life and she isn’t interested in him nor is he interested in her. They are work friends. I really do like her. I really wouldn’t if I thought at all that there were any feelings there besides friends. I can see how looking from the outside it might seem that way. I definitely would feel the same way if a male co-worker were calling him every night. It is just getting old. And like another poster said, she doesn’t know her boundaries. He doesn’t seem super enthused when she calls so I wouldn’t say he enjoys these daily phone conversations. He sometimes even huffs or rolls his eyes. He is just a very nice person who doesn’t want to hurt her feelings. I AM a little annoyed with him though that he doesn’t just let it go to voicemail. I agree with SonnyJane...we teach people how to treat us and he IS teaching her that it is okay to call everyday.
Yesterday on the way home from work, we were talking about being tired from the work day and he brought it up. He said that he realized that I was a little ticked at him about the calling situation. He said that he was going to start letting her calls go to voicemail and she could either leave a voicemail or not. Hallelujah!! Just what I had already suggested. So we will see if he follows through with that. No call last night. I was disappointed.

I wanted to see if he let it go to VM. This is the first day in several weeks that she hasn’t called.
Speakerphone—this is just a habit we have gotten into. We are usually both talking to whoever is on the phone...our son, daughter, MIL, FIL...so we just put it on speaker phone so we both can talk to them. We never do this in public. That drives me crazy too, when someone does that in public. We really don’t talk on the phone very much. Just when we do, we both talk. I’m definitely a text kind of person. I rarely answer my phone unless it is one of the above. I don’t normally talk to her when she calls, mainly because I’m not happy that she has called again. I will only chime in if she asks something that I need to answer which is very rare because my work is very different than their work and I know very few of the people that they work with. She would be just fine talking to both of us. She is just very outgoing and loves to talk—-too much!
Info someone asked for...she is married and has grown children just like we do. She seems very happy and secure in her marriage.