Thank you for your time and sorry for the delay.
Q.Does the issue occur only with VPN users or is it the same with users on the LAN? Is it specifically inbound / outbound calls to / from the PSTN to the VPN users?
A.Jabber to Jabber internal calls and inbound call from sip trunk. We dont have call center user in the office, they are all vpn, but no case with physical phone at the office.
Q.You refer to some users who have issues with one way voice. Does that mean that other VPN users don't have issues with one way voice?
A.Some users have the issue at the morning, and the issue disappear in the afternoon but appear for other user in the afternoon. No ip address changes seen and dont see asa fallback.
Q.What's different about the affected users vs non-affected users?
A.We dont dont yet All brand new lenovo pc. We may have more issue with pc than laptop, but not really sure about that. We tested with a different user logged to the pc and we have the same issue.
Q.Do they obtain an IP address from the same pool of addresses as your other VPN users or are they on a different pool of IP addresses?
A.We cannot find a ip address range having more issue or they dont have more problem on 1 ASA cluster than the other.
Q. Are the non-affected and affected users have VPNs established on the same ASA?
A. Yes on the same ASA
Q. For outbound calls which target the SIP gateway (assuming CUBE) is the ASA your Internet gateway and therefore upstream of the CUBE?
A. We have the issue within the internal network so I will discard the Sip gateway/Cube
Q. Was SIP Inspection disabled already or just disabled for troubleshooting purposes?
A. Was enabled on 2/3 asa. Now 3/3 are disabled.
Q.Is your ASA configured to allow the RTP port range your CUBE operates on? Do a "show voip rtp connections" on your CUBE to find out the default range it operates on and ensure your ASA is allowing that entire range.
A.I will need to check the ASA firewall rule, but it's mostly any/any within the internal network/vpn
Q.I am a little unclear on what you mean by agent.
A.Agent is user logged into Finesse/ICM
Q.I would also advise you take debug ccsip messages of a working call and one of a call where the issue was experienced, compare them and check what's different, e.g. different SIP signalling sources, RTP IP addresses etc.
A.We have the same issue in nternal network, we looked to SDL trace and cannot find any informations.
Q.I would also advise packet captures taken from the ASA and the CUBE if we're troubleshooting one way voice issues to / from the PSTN.
A.We take capture from 2 PC with Jabber, the sender see packet loss, but in the trace we can see duplicate packet.1 with fffffff payload (Silence) and another with normal payload. so it give us Out-of-order/wrong sequence packet
Note : We also installed CIPC on user's pc with the issue and we got the same behavior, but if the called number have cipc it's working fine.
Note : If we enable MTP, the audio is working but it's really bad
