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Hi,<br />
Here is the way that we currently use our phones at home offices but we are on CM8, not 100% express with work with the below setup.<br />
<br />
<a href="https://supportforums.cisco.com/docs/DOC-9124" rel="ugc">https://supportforums.cisco.com/docs/DOC-9124</a><br />
<a href="http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/8_0_1/secugd/secuvpn.html" rel="ugc">http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/8_0_1/secugd/secuvpn.html</a><br />
<br />

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Hi,
Here is the way that we currently use our phones at home offices but we are on CM8, not 100% express with work with the below setup.

https://supportforums.cisco.com/docs/DOC-9124 [https://supportforums.cisco.com/docs/DOC-9124]
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/8_0_1/secugd/secuvpn.html [http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/8_0_1/secugd/secuvpn.html]



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ikalmar is correct. You want to use a hardware VPN between the remote sites and the head office. You need to make sure you configure the TFTP server (point to the UC Express system) &nbsp;in your DHCP options on the remote router. <br />
<br />
Otherwise if you want to save on money, you can go for the Cisco IP Communicator which is the 7975 softphone and use the Cisco VPN client to connect back to the head office. 
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ikalmar is correct. You want to use a hardware VPN between the remote sites and the head office. You need to make sure you configure the TFTP server (point to the UC Express system)  in your DHCP options on the remote router.

Otherwise if you want to save on money, you can go for the Cisco IP Communicator which is the 7975 softphone and use the Cisco VPN client to connect back to the head office.

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Experts,<br />
<br />
We have a Cisco UC Express Version 7 using Cisco IP Phone 7940 Series.. I am looking for the ability to allow remote users to have a Phone at their Home Office. How would I go about accomplishing this. SO far only one out of Three Users have been able to have a phone work at their Remote Office.<br />
<br />
Any help would be greatly appreciated.
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Experts,

We have a Cisco UC Express Version 7 using Cisco IP Phone 7940 Series.. I am looking for the ability to allow remote users to have a Phone at their Home Office. How would I go about accomplishing this. SO far only one out of Three Users have been able to have a phone work at their Remote Office.

Any help would be greatly appreciated.

Using a Cisco IP Phone in a Remote Office

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

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).