I am trying to troubleshoot an issue with a VoIP unit called Aastralink PRO 160. I seem to be having repeated issues with this unit and according to the vendor it seems to be a Cisco issue.
I only have access to the switch at the access layer and I need to know if there is any QoS policies being distributed and/or any sort of implementation of Cisco's SIP that may interfere with the functioning of this unit. I know this is general but what can I do to ensure that QoS and SIP on this Cisco switch are not interfering with the functioning of this VoIP unit.
Bear in mind that your device (if it marks packets) may mark them differently to what the autoqos is expecting. If the device doesn't mark the packets at all, you may need to get them marked on the 3750.
If you only have access to the switch at the access layer, you may need to have a chat to the administrators of the core to ensure that the device or your switch is marking the packets to the right TOS value.
Having said that, it may not be a qos issue anyway, have you checked spanning-tree, port speeds and duplexing (for the device and all uplinks etc), have you checked the cable etc.
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