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Cisco Bug: CSCvu89214 - IOS-XE+ZBFW+CUBE: One-way Audio. TCP 5060 is not recognized as SIP.

Last Modified

Sep 03, 2020

Products (1)

  • Cisco 3G Wireless WAN

Known Affected Releases

16.9.4

Description (partial)

Symptom:
One way audio will appear for phone calls when the router is configured with IOS-XE+ZBFW+CUBE and the class map defined to match the TCP SIP packets is using an ACL.


Then, the traffic is just classified as TCP as the following:

     Session ID 0x00000036 (30.30.30.30:43154)=>(10.0.0.100:5060) tcp SIS_OPEN
          Created 00:08:03, Last heard 00:00:03

     Session ID 0x00000045 (20.0.0.200:52137)=>(20.0.0.254:5060) tcp SIS_OPEN


Ideally, for having a working scenario, the traffic must be recognized by ZBFW as the following:

Session ID 0x000001A6 (20.0.0.254:53231)=>(20.0.0.200:5060) sip SIS_OPEN
       Session ID 0x000001BF (30.30.30.30:58139)=>(10.0.0.100:5060) sip SIS_OPEN

NOTE: Use "show policy-firewall sessions platform all detail" to verify if the signaling is not being treated as SIP.

Conditions:
- IOS-XE
- ZBFW on router.
- CUBE on router.
- Voice solution using TCP SIP on standard port
- ACL is used in class map to match the SIP packets.
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