Another opportunity to improve customer service is to provide customers with self-service information. If you have help documentation or resources online, be sure to mention them on hold, so that your callers can access that helpful content on their own, leaving your staff free to help with more unique concerns.
Phone System feature. Description. Cloud auto attendants. Lets you create a menu system that enables external and internal callers to locate and place or transfer calls to company users or departments in your organization. Note that users do not need to be voice enabled to receive calls from the auto attendant.

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Even if you have a VoIP telephone system, your call will eventually go across the PSTN (like the traditional landline calls), where network operators are able to do whatever they like. Plus VoIP and mobile operators use high-compression codecs that degrade the overall quality of the sound. A good codec can take a 9600bps audio stream (toll quality ISDN voice) and take it down to the required bandwidth by a factor of 10 or more.