Cisco Bug: CSCvu89214 - IOS-XE+ZBFW+CUBE: One-way Audio. TCP 5060 is not recognized as SIP.
Sep 03, 2020
- Cisco 3G Wireless WAN
Known Affected Releases
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 (188.8.131.52:43154)=>(10.0.0.100:5060) tcp SIS_OPEN Created 00:08:03, Last heard 00:00:03 Session ID 0x00000045 (184.108.40.206:52137)=>(220.127.116.11:5060) tcp SIS_OPEN Ideally, for having a working scenario, the traffic must be recognized by ZBFW as the following: Session ID 0x000001A6 (18.104.22.168:53231)=>(22.214.171.124:5060) sip SIS_OPEN Session ID 0x000001BF (126.96.36.199:58139)=>(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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