ASA 5550 inspect necessary for h323 and SIP?

Is it necessary to have "inspect h323 h225", "inspect h323 ras", and "sip inspect" active on an ASA 5550? We have a VCSC, deployment of telepresence vcse... just wondering if with these permits, if there is no possibility of causing packet loss to public or external codecs the inspection process. We have a 250 MB, Internet connection... General average use runs approximately 180 MB. Twice a week or two, we get loss of packages are essential to some of the external codecs... I was wondering if by disabling the inspection process, so who would speed things a bit or other problems.

Thank you for your response.

Charlie

Hello

If your VCSE is not behind a NAT on its way to the internet, you can go one disable any SIP/h.323 inspection mechanism, once this may cause some problems and it is not at all in your case.

Communication between the control VCS and motorway, it is strongly recommended not having NAT of VCS Control to VCS Expressway, once that VCS control is not in a position to address NAT inside SIP/H3232 messages, and you may not use any mechanism of inspection/ALG SIP / h.323 in this way once he can cause problems because the communication uses a non-standard protocol The sanction of cisco.

Problem of packet loss, however, is not much related to inspection firewall features. You tell him you have enough bandwidth in your link to the appeal, but you should also ask, the remote side has bandwidth enough to host the call? Packet loss can occur in any part of the whole path of the call, then you should analyze the path of the entire network, end to end. Also, the links internet it is not possible to apply QoS (normally), so you really do not guarantee that your traffic is be prioritized by your service provider and the remote site.

Concerning

Paulo Souza

My answer was helpful? Please note the useful answers and do not forget to mark questions resolved as "responded."

Tags: Cisco Support

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