Quote Originally Posted by commspring View Post
I use an app called Zoiper for clients. It is available for Android and Apple. Simply add the sip credentials and authenticate. Now your clients have their office phone on their smartphone. A great feature is that all contacts on their phone are automatically available as contacts on the app.

They will create a "white label" app for you for a fee, but I've never had an issue with any clients using the "off the shelf" version.

I've used Zoiper for years ... from the time before smart phones were fashionable :-). Remember using it on a laptop. I also have it installed on my smart phone (see post #25 above).