Philips voip 841 dual line phone landline connection problem?

My 841 buzz will not connect to the landline, either dialing manually or through the contacts folder. The buzz rings when receiving a landline call, but after answering the buzz not anything happens. Another buzz on the same line keeps ringing, but the 841 shows up as answering the call. The battery is fully charged and the handset is connected to the base unit. The Philips manual doesn’t have any info on this problem. Is there anyone out there using this buzz and has seen this problem?
Yes, it’s the same type of buzz, but a later model.

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