Cisco UC520 phone system Behind ASA firewall.

We have an ASA 5520 in place as firewall/rotuer/vpn. We will be adding a Cisco UC520 to our network. I am new ot the UC520 and VOIP .
Can the UC520 stay behind the ASA and still use a SIP gateway service. Does that create issues down the road. I know the UC520 also has firewall/vpn/routing , but not sure if that is going to cause issues.
What had to be done on the ASA and also the UC520 for them to work on the network?
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netcompAsked:
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Alex BaharConnect With a Mentor Commented:
Do not enable the VPN & firewall on UC520 as you're proving these services on ASA.
Take a lok at the following link for an example ASA configuration>
http://www.experts-exchange.com/Networking/Telecommunications/IP_Telephony/VoIP/Q_24719953.html
On ASA you need to inspect/allow> SIP, RTP. You need to enable QoS for voip.
If you have remote SCCP phones, then you need to inspect skinny as well.
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ullas_unniConnect With a Mentor Commented:
you need to inspect the voice protocols on the ASA.
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Alex BaharConnect With a Mentor Commented:
Forgot to say> for your remote SCCP phone you need to open tftp as well. Just follow the example configuration, it has all information you need.
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uniplastCommented:
In my experience, ASA works very well with the UC500. I am not even any special settings worked, and everything works OK.
In any case, you can turn off the firewall and NAT in UC500
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