I'm new to the Cisco Router/ Call Manager world. If you don't have enough PVDM's in the route, will that cause a one-way audio issue. I know I need to add PVDM's to the router we're using, but just wanted to know if having a lack of PVDM's will cause a one-way audio problem. I'm able to 4 digit dial between the site. I can hear the other person, but they can not hear me. Any suggestions are extremely helpful. Thanks.