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Network Devices with Potential Compatibility Issues for VoIP Services
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Network Devices with Potential Compatibility Issues for VoIP Services

Purpose

The purpose of this article is to provide a compilation of devices that have known issues with hosted VoIP services. This list includes the most commonly owned devices that might cause disruptions in service. If your device is not on this list, this does not mean it is fully compatible, only that testing has not been documented for that device. Each device listed has been tested and either has a documented configuration to which a link has been provided, or is not configurable for one reason or another for hosted VoIP services. This list will be updated over time as needed.

Keep in mind different firmware versions will interact with hosted VoIP services in different ways. While a device may be fully functional on a current firmware version, it is possible newer revisions will cause disruptions in service or make a device fully compliant with the required settings for hosted VoIP services where it was previously not.

Actiontec

Model(s) Known Issues Issues Observed
All Yes

Symptom: Call quality and device registration issues.

Solution: Device does not have configurable options for the phones beyond low/medium/high firewall options. Unable to disable SIP ALG

ONT port should be enabled on Fios unit and Actiontec removed from network. After this is complete, replace the Actiontec with a known good device.

Asus

Model(s) Known Issues Issues Observed
All Yes - Requires configuration

Symptom: Call quality and device registration issues.

Solution: Disable SIP and RTSP passthrough

AMPED

Model(s) Known Issues Issues Observed
All Yes

Symptom: Dropped calls, one way audio, device registration issues.

No access to SIP ALG. Firewall blocks all SIP services.

Solution: Replace with a known good device, or separate network for phones with a known good device.

Apple Airport

Model(s) Known Issues Issues Observed
All Yes

Symptom: Dropped calls, one way audio.

Solution: Device has no way to disable SIP ALG and no configuration options for VoIP services. Device must be replaced with a known good router.

Barracuda

Model(s) Known Issues Issues Observed
All Yes. Additional testing is required.

Symptom: Dropped calls and call quality issues (garbled/choppy audio) and phone registration issues.

Solution: Separate phones from Barracuda and use a different firewall or router.

Belkin

Model(s) Known Issues Issues Observed
All Yes

Symptom: Dropped calls. NAT Security is also extremely low and prone to ghost calls.

Devices have no way to access ALG setting.

Solution: Replace with a known good device.

Cisco RV

Model(s) Known Issues Issues Observed

RV016/042/082/220

RV180 - Configuration

RV325 - Configuration

Yes. Issues can depend on phone models in use.

Symptom: Misrouting calls, call drops, device registration issues. Specific to Polycom phones.

Solution: Disable SIP ALG if using Cisco phones.

Replace with a known good device if using Polycom phones for RV016/042/082/220

**Devices work fine with Cisco phones. 

Untested on Yealink.

Fortigate

Model(s) Known Issues Issues Observed
All Yes. Requires specific configuration to work.

Symptom: Call drops, call misrouting, one way audio, device registration issues.

Solution: Configure per recommended guidelines.

**Some firmware revisions will revert all VoIP settings to defaults.

Google Routers

Model(s) Known Issues Issues Observed
All Yes

 Symptom: One way audio, dropped calls, general call quality issues.

Solution: Replace with a known good device. Device has no way to disable SIP ALG.

Internet Service Provider Modem Routers (Gateways)

Model(s) Known Issues Issues Observed
All Yes

Symptom: Call Drops, one way audio, device registration issues, potential misrouting, general call quality issues.

Solution: Bridge device and use a stand-alone router to handle all traffic on the LAN.

Linksys

Model(s) Known Issues Issues Observed
All EA Series with firmware 1.1.7.180968 and above Yes. Device will work fine for a single phone.

Symptom: Dropped calls, misrouting, device connectivity issues. This is due to the NAT process and has no way to be resolved if there are multiple phones on the network.

Solution: If more than one phone is in use local SIP ports can be set on the devices to mitigate issues. If issues persist the router will need to be replaced.

 

Meraki

Model(s) Known Issues Issues Observed
All Yes

Symptom: Dropped calls, one way audio, device connectivity issues.

Solution: Device does not require specific settings to allow VoIP service, but a secondary device providing NAT or DHCP services will break the NAT process on the Meraki. For VoIP phones this will cause multiple issues.

Netgear - Nighthawk

Model(s) Known Issues Issues Observed
All Yes. Device requires specific configuration to work with VoIP services.

Symptom: dropped calls, device connectivity, misrouting.

Solution: Configure per recommended guidelines.

 

Netgear Mesh - Orbi

Model(s) Known Issues Issues Observed
All Yes

Symptom: Dropped calls, device connectivity issues, one way audio.

Solution: Devices lack compatible VoIP settings. Device will need to be replaced, or used in AP mode with another router. 

Palo Alto

Model(s) Known Issues Issues Observed
All Yes. Requires specific configuration.

Symptom: Dropped calls, device registration issues, one way audio.

Solution: Configure per recommended guidelines.

Sophos

Model(s) Known Issues Issues Observed
XG and SG Yes

Symptom: Call Misrouting, Call drops, Call transfers failing, Device connectivity and registration issues, NTP issues 

Solution: Configure per 8x8 guidelines. Device requires SIP Modules (SIP ALG) to be enabled for VoIP traffic. 

Tested on Firmware 17.1.3

Sonicwall

Model(s) Known Issues Issues Observed
NSA/TZ Yes. Requires specific configuration for VoIP traffic.

Symptoms: Dropped calls, one way audio, garbled/choppy audio, device connectivity issues.

Solution: Configure per recommended guidelines. Some settings are firmware dependent, and some firmware is not compatible with VoIP service.

Ubee Modem Routers

Model(s) Known Issues Issues Observed
All Yes

Symptom: Unable to call 1800 number or specific area codes, dropped calls, one way audio.

Solution: Disable SIP ALG on the Ubee.

**Any firmware updates from the ISP will revert these settings changes.

Ubiquiti

Model(s) Known Issues Issues Observed

Unifi

Edgerouter

Yes

 

Symptom: Dropped calls, one way audio, misrouting, device registration issues.

Solution: Device currently has no known good configuration, but can work for services. Device should be configured using general recommended settings.

Untangle

Model(s) Known Issues Issues Observed
All Yes

Symptom: Dropped calls, one way audio.

Solution: Configure per recommended guidelines.

Watchguard

Model(s) Known Issues Issues Observed
All

Yes 

Symptom: Dropped calls, device registration errors, potential misrouting, one way audio

Solution: Device requires specific configuration to work. 

Zyxel/Zywall

Model(s) Known Issues Issues Observed
USG-50/USG-20 Yes.

Symptom: Dropped calls, one way audio.

Solution: Polycom phones require SIP ALG to be enabled. This will cause Cisco phones to go offline or experience call quality issues.

Cisco Phones require SIP ALG to be disabled, this will cause Polycom phones to go offline or experience call quality issues.

If there are a mix of phones on the network, the firewall will need to be replaced.

 

Additional Information

To check if your router or firewall has a known good configuration, see if your device is listed in this article.

If you are unable to locate your device on this list, or within our network devices area, use our general settings for configuration.

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