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RTP traffic not visible

Hi All,

Requirement : To analyse the RTP packets in voice traffic on Firewall.

Problem: I have cisco 5550 firewall. I am mirroing Inside interface traffic on one switch and capturing RTP and singaling traffic. Here on Inside interface I can capture RTP traffic through Wireshark.

But when i capture the same traffic for Outside interface of same firewall on same switch, RTP packets are not visible. Only singaling packets are visible..

Its not like that RTP packets are getting dropped on firewall, bcz my voice call are UP and running fine. But while analysing the RTP traffic on Outside interface, it not getting captured on wireshark.

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