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Nathaniel Halbrooks

Kelli Higdon

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For example on an SBC the RTP port range might be ports 10000 - 20000. The following filter will exclude packets to/from these ports and therefore not capture RTP packets:

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not portrange 10000-20000

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You can find the RTP port range on your SBC in the WebUI under Configuration -> IP Settings -> Media Interfaces.

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  • only captures packets to/from port 5060:

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port 5060

  • captures only packets to/from ports 5060 to 5070:

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portrange 5060-5070

  • captures everything except packets to/from port 80:

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not port 80

  • captures everything except packets to/from ports 10000 to 20000:

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not portrange 10000-20000

  • It is also possible to combine filters. This filter captures everything except packets to/from ports 10000 to 20000 and port 80:

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not portrange 10000-20000 and not port 80

Further capture filters can be found on the tcpdump manpage.