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jeffcarp

WIFI Calling & messaging bandwidth

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We're starting discussions with a collegiate client who is building a new building, about supporting Wi-Fi calling and messaging rather than investing in a DAS. Can anyone point me to any credible technical information that would provide some guidance on the bandwidth of the compression schemes used in Wi-Fi calling and messaging?

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I would start with investigating and learning as much as you can about the G.7 voice codecs used in telecommunications services.

 

 

https://en.wikipedia.org/wiki/List_of_codecs#Voice

 

see also

 

https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/7934-bwidth-consume.html

 

 

and searching for voip codecs will provide a lot of material to check out.

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Here is a simplified question for you:

 

Will the building have WIFI with specific ports open for guests/employees to use? What network bandwidth are you looking to install in said building?

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https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/7934-bwidth-consume.html

 

 

and searching for voip codecs will provide a lot of material to check out.

Thanks for that Cisco link. That's very helpful.

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Here is a simplified question for you:

 

Will the building have WIFI with specific ports open for guests/employees to use? What network bandwidth are you looking to install in said building?

Yes, they have full building 802.11ac wifi deployments as standard with guest, student and faculty ssids. They've just never supported wifi calling of any kind before so we're looking at the density and bandwidth implications of doing so.

 

This is a 36,000 student campus and we're not privy to their overall campus bandwidth but the building will have dual fiber entrances as part of a fiber ring.

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Yes, they have full building 802.11ac wifi deployments as standard with guest, student and faculty ssids. They've just never supported wifi calling of any kind before so we're looking at the density and bandwidth implications of doing so.

 

This is a 36,000 student campus and we're not privy to their overall campus bandwidth but the building will have dual fiber entrances as part of a fiber ring.

 

I would anticipate VoWIFI calls to be 64kbps each. The required open ports may be an issue though.

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I would anticipate VoWIFI calls to be 64kbps each. The required open ports may be an issue though.

 

Whatever service Google is using these days for VoIP -- Gmail, Google Voice, Google Talk -- runs about 80 kbps in each direction.  That likely is a 64 kbps payload with the rest as overhead.  For 3GPP codecs, the bit rates would be half that or less.

 

AJ

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