This article describes known issues and setup steps for Cisco/Linksys RVS4000
- This router mismanages RTP audio packets    , causing many customers intermittent one-way audio problems. Replacing the router provided a permanent solution. However, the recommendations below may help.
- We need more information on this router to find out if the other basic router requirements can be made on this router.
- Change the MTU from Auto to one of the options below.
- This setting is usually found under Setup > Network > WAN.
- Your router may reference WAN as Internet Settings or with slightly different terminology, depending on the model and firmware:
- 1500 for Cable
- 1492 for DSL
- FiOS using PPPoE (most pre-2006 FiOS circuits) – 1492
- FiOS using DHCP (most post-2006 FiOS circuits) - 1500
- Contact your ISP if you're unsure.
- Some Cisco VoIP users report that their issues were resolved by upgrading the firmware to v1.2.1 or higher.
Check the router firmware version. If it's below 1.2.1, please ask your IT team to call Cisco to upgrade the firmware.
- If the MTU is correct, the firmware is higher than 1.2.1, and you have no other network issues but you still experience intermittent one-way audio problems, then you'll need to replace the router with a compatible one.
- Intermedia cannot set up the new router for you, but your IT or the manufacturer of your new router can help you. They will need to move settings from the old to the new router to ensure your computers and other devices on the network work properly.
- We need more information on this router to find out if the other basic router requirements can be made on this router. Please contact Intermedia Voice Technical Support so we can better document other necessary changes that are necessary for this router.
- Go to
QoS ,then to Bandwidth Management
- Set Bandwidth Management to Enable
- Under Bandwidth Management type select type Priority
- Select Service Management.
- In the popup, enter the service name CloudVoiceSIP, Protocol - UDP, Port range: 5678 - 6899, click Add to List
- In the popup, enter the service name CloudVoicePorts, Protocol - UDP, Port range 30000 - 60000, click Add to list
- Click Apply
- Under Priority select CloudVoiceSIP, direction Upstream, Priority High, check Enable, then Add to list
- Under Priority select CloudVoiceSIP, direction Downstream, Priority High, check Enable, then Add to list
- Under Priority select CloudVoicePorts, direction Upstream, Priority High, check Enable, then Add to list
- Under Priority select CloudVoicePorts, direction Downstream, Priority High, check Enable, then Add to list
- Click Save