Can Cisco PIX Firewall 525 with IOS v6.3 support sip?

This is using PIX firewall 525 with v6.3, and a Cisco router 3700. I'm thinking of work with my contractor for the implementation of Voip. I know nuts about Voip. But, according to my contractor, this voip is using sip. I also heard that 2 vlans - one for data, one for voice are needed.

I'm more concern about what had need to be done on the firewall? router? switches?

Anyone can guide me what to be done on the above equipments, possibly with other requirements, such as, public IPs?
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Faruk Onder YerliOwnerCommented:
6.3 is not support traversal NAT. You have to use SIP proxy inside network and you have to make static NAT to SIP proxy.

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you need to do
no fixup protocol sip 5060
no fixup protocol sip udp 5060
and allow contractor specific ports after doing a static Nat or so.
BalackAuthor Commented:
Hi all,

Does it mean I have to configure Static-NAT for one real-IP mapped to Public-IP? and then configure UDP 5060, and contractor-specific Ports to access thru firewall?

And then disable inspections on sip application (as mentioned by yashinchalad). Using SIP Proxy instead?

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