For Immediate Release Contact: Angie Sparks Day, April 6, 2009 (805) 498-8718 ext. 104 angie@mustangmktg.com Phone On-Hold Marketing Systems Receives ISO 9001 Certification Phone On-Hold now the only on-hold messaging service in the world with ISO 9001 Certification Newbury Park, Calif. – Phone On-Hold® Marketing Systems, Inc., the leader in on-hold messaging solutions, has recently