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Yes you can you just setup voip dial peers to trunk the call to the other UC. The problem is that you need to segregate your network into two seperate subnets or voice VLANS as each set of IP phones need to get their TFTP server info to point them to the correct UC520. Lastly the make sure you redo all of the default dial plan numbering schemes so your UCs don't overlap it makes for easier deployment. 
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Yes you can you just setup voip dial peers to trunk the call to the other UC. The problem is that you need to segregate your network into two seperate subnets or voice VLANS as each set of IP phones need to get their TFTP server info to point them to the correct UC520. Lastly the make sure you redo all of the default dial plan numbering schemes so your UCs don't overlap it makes for easier deployment.

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 how can can i configure i voip dial peers to trunk the call to the other UC<br />
do you have any sample config.<br />
&lt;input id=&quot;gwProxy&quot; type=&quot;hidden&quot;&gt;&lt;!--Session data--&gt;&lt;input onclick=&quot;jsCall();&quot; id=&quot;jsProxy&quot; type=&quot;hidden&quot;&gt;
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how can can i configure i voip dial peers to trunk the call to the other UC
do you have any sample config.
<input id="gwProxy" type="hidden"><input onclick="jsCall();" id="jsProxy" type="hidden">

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Hi I have a senario where we have one UC 520 ( PRI &nbsp;Intreface)with 40 users, now number of users has grown to 70, can I connect one more UC 520 to club all users on same PRI, we dont require any more telco line. &nbsp;<br />
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Pls. reply asap
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Hi I have a senario where we have one UC 520 ( PRI  Intreface)with 40 users, now number of users has grown to 70, can I connect one more UC 520 to club all users on same PRI, we dont require any more telco line.  

Pls. reply asap

Can I club two Cisco UC 520

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).