A:AnswerHi - The compatible expansion handset for the VTech CS5129-26 is the model CS5109-16. The telephone base can register up to 5 handsets.
Thank you,
-VTech Support
A:AnswerHi - The VTech CS6229-2 does not have a do not disturb feature. You may check the ringer settings instead on the cordless handset.
Thank you,
-VTech Support
A:Answerdepending on your model I believe you can add man handsets for additional cost, but you you have to check on the cost with your place of purchase.
A:AnswerYes the main base can be mounted on the wall the set comes with mounting bracket. As far of how many handsets it depends which v tech you purchase two or four handset I hope this answers your questions