<div>
Thanks for the info, jfaubiontx. I should add that sometimes the calls actually do work, but the sound quality is horrible. Do you think that the issue might be related to NAT traversal? I'm thinking it is more of a QoS issue. Thoughts? 
</div>


Thanks for the info, jfaubiontx. I should add that sometimes the calls actually do work, but the sound quality is horrible. Do you think that the issue might be related to NAT traversal? I'm thinking it is more of a QoS issue. Thoughts?

<div>
<div class="content wysiwyg-content">
Soft phone users connecting over a SonicWall SSL vpn have one way audio (the user can hear the person they call, but the receiving caller cannot hear them). Zultys tech support was not helpful. 
</div>
</div>


Soft phone users connecting over a SonicWall SSL vpn have one way audio (the user can hear the person they call, but the receiving caller cannot hear them). Zultys tech support was not helpful. 

MXIE Soft Phone has one way audio

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.

Software Firewalls

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.

Telecommunications

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).