I don't care how good your cause is, if you cold-call me and start by telling me that "as always, this call may be monitored or recorded," I'm going to interrupt, tell you this isn't acceptable, and hang up.
If I am calling you on business, not only may your organization have a legitimate reason for this, I have less of a choice. I need to talk to my health insurance company, credit card, etc. I don't need to talk to someone who is calling to ask me for a political contribution.
That's aside from the implication that the organization doesn't think its own staff can be trusted to do their jobs without someone listening in on the calls. If you can't trust them to ask for money, I can't trust them not to misuse my credit card information if I say yes. (I normally explain to such solicitors, politely, that I don't make contributions over the phone, and they are welcome to send a letter.)
If I am calling you on business, not only may your organization have a legitimate reason for this, I have less of a choice. I need to talk to my health insurance company, credit card, etc. I don't need to talk to someone who is calling to ask me for a political contribution.
That's aside from the implication that the organization doesn't think its own staff can be trusted to do their jobs without someone listening in on the calls. If you can't trust them to ask for money, I can't trust them not to misuse my credit card information if I say yes. (I normally explain to such solicitors, politely, that I don't make contributions over the phone, and they are welcome to send a letter.)