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CISCO SWITCHES FOR SMALL and MEDIUM BUSINESS

Introducing the next generation of Cisco Small and Medium Business Switches. Cisco is refreshing its SMB Switch portfolio. Click here  to learn more.


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Beginner

Setting up Cisco SLM248GT-NA switch for VoIP

Hello Everyone,

We have a Cisco slm248gt-na smart switch in our office that I am trying to configure to support and optimize for VoIP. We have desktops hooked up off the phones in most cases. Are there any config guidelines to optimize the switch so it has proper QOS set and VoIP gets higher priority over data.

Thanks, Kind Regards

Shabbir

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Hall of Fame Master

Setting up Cisco SLM248GT-NA switch for VoIP

Wrong forum, post in "small business - switches". You can move your post using the actions panel on the right.

Advocate

Setting up Cisco SLM248GT-NA switch for VoIP

Hi Shabali, this depends what else is on your network. The SF200 switch supports auto voice vlan. The auto voice vlan can work through cdp or lldp depending on the phones you have.

If you have a router that supports a second vlan then you may create a second vlan then configure the voice vlan as that second vlan id. This will automatically ensure the voice traffic is tagged to the second vlan and assign QoS parameter within the voice vlan macro.

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
Beginner

Setting up Cisco SLM248GT-NA switch for VoIP

Hello Tom,

Thanks for your reply.

We have a pretty straight forward setup. We have 15 Cisco SPA303 phones hooked up to switch and the desktop are connoted via the phone. We have a wireless LAN and a corporate server that servers as a file sharing/vpn type setup. Other than that there are no devices hooked up. We had to implement auto voice vlan feature but were still running into issues like occasional poor voice quality and one way audio type issues. However I did notice something in the configuration menu "Telephone OUI", could you please help us on how to implement that. We are trying to implement best practice to avoid voip related issues that we have been having.

We also see all the ports in trunk mode. Is that the recommended setting or should we change it to access mode?

Thanks, Kind Regards

Advocate

Setting up Cisco SLM248GT-NA switch for VoIP

Hi shabali, you don't actually want to use Telephony OUI. You may use auto voice vlan OR telephony OUI but not both.

If you're having sound quality issues it can be many things. If you're have poor voice quality, is this for extension to extension calls or is this for LAN to WAN calls? Do you have a hosted service or a local PBX? If you connect an IP phone directly to your router do you have the same problems? Do you have a dedicated internet connection for the phones? How fast is your internet?

Your voice quality problems likely is not your local network ( it is possible but not likely ).

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/