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I need a secure way to allow my SIP clients to connect to my CUCM and have call quality. &nbsp;What options do I have. &nbsp;I want to use my existing Internet pipe (T-3). &nbsp;I'd rather not just open up ports on my firewall directly to the CUCM server. &nbsp;<br />
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Are there good 3rd party hardware devices that are reasonable that can handle that job? &nbsp;I'm looking at about 50 - 100 external sip users.<br />
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We already use the sip with VPN but that is cumbersome and using the Cisco mobile 8 is only good using the VPN. &nbsp;When the tunnel drops your dead in the water and people miss calls.<br />
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I want my I-pad and iphone users plus all IP Communicators on laptops to be able to have there phones running whether the VPN is up or not.
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I need a secure way to allow my SIP clients to connect to my CUCM and have call quality.  What options do I have.  I want to use my existing Internet pipe (T-3).  I'd rather not just open up ports on my firewall directly to the CUCM server.  

Are there good 3rd party hardware devices that are reasonable that can handle that job?  I'm looking at about 50 - 100 external sip users.

We already use the sip with VPN but that is cumbersome and using the Cisco mobile 8 is only good using the VPN.  When the tunnel drops your dead in the water and people miss calls.

I want my I-pad and iphone users plus all IP Communicators on laptops to be able to have there phones running whether the VPN is up or not.

I need gateway to allow my Cisco CUCM SIP users to come in through my Internet pipe

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).

Voice Over IP

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.