Posted on September 12, 2018 by nasim — Leave a commentFlexibility VoIP calls are cheaper and more flexible than ISDN lines in terms of the phone numbers you can have and the locations. Post navigationPrevious post: Remote WorkingNext post: Cost Saving Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email.