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Have yet to get any feedback... HELP!!
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Feel free to confirm whether this works for you or not. These are the settings I changed in my Juniper firewall.
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Feel free to confirm whether this works for you or not. These are the settings I changed in my Juniper firewall.

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Device: NEC DSX 40 Hybrid Key Telephone System.<br />
<br />
Local: Digital phones on site<br />
Remote: IP Phone<br />
<br />
Network Setup: Site-to-Site VPN<br />
<br />
Firewall1: Checkpoint (Local)<br />
Firewall2: Juniper (Remote)<br />
<br />
We are attempting to get an IP phone to communicate with the telephone switch via VPN. We've setup the VPN between sites and are able to connect the phone to the switch. We can see the lights for lines in use. We can make and receive phone calls, BUT voice traffic is only one way (from IP phone out). The IP Phone cannot receive any audio.<br />
<br />
My rationale is that through the VPN everything is open as far as routed traffic, so I'm at a loss as to why voice traffic is only going one way.<br />
<br />
I have tried opening up ports to the device, but I don't believe that should make a difference and I'm trying to get internal voice going both ways, before I worry about external.<br />
<br />
Any help will be much appreciated.
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Device: NEC DSX 40 Hybrid Key Telephone System.

Local: Digital phones on site
Remote: IP Phone

Network Setup: Site-to-Site VPN

Firewall1: Checkpoint (Local)
Firewall2: Juniper (Remote)

We are attempting to get an IP phone to communicate with the telephone switch via VPN. We've setup the VPN between sites and are able to connect the phone to the switch. We can see the lights for lines in use. We can make and receive phone calls, BUT voice traffic is only one way (from IP phone out). The IP Phone cannot receive any audio.

My rationale is that through the VPN everything is open as far as routed traffic, so I'm at a loss as to why voice traffic is only going one way.

I have tried opening up ports to the device, but I don't believe that should make a difference and I'm trying to get internal voice going both ways, before I worry about external.

Any help will be much appreciated.

NEC IP Phone one-way audio through VPN

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

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

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).