ShoreGear Switch Resources

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ShoreGear Switch Resources

Today’s topic address the ShoreGear Voice Switches how resources are allocated.

ShoreTel has 10 part numbers associated with their ShoreGear Voice Switches:

The number associated with each voice switch indicates the maximum quantity of IP resources that voice switch can accommodate.

Only two model switches do NOT support analog resources: SG-220T1 and SG-T1K. (ShoreGear = SG)


Voice Switch Characteristics

The ShoreGear Voice Switches are sealed appliances with the only moving part being the cooling fan.

  • VX Works is the OS for the voice switches (The V model switches are voicemail capable and uses Linux for the OS)
  • Redundant LAN ports
  • Peer to Peer routing tables
  • Power-Fail port
  • Music On-Hold port
  • Paging Port or Night Bell audio output
  • RS232C DB-9 Maintenance port
  • Environmental monitors


Voice Switch Capacities


1U Half Width Switches

SG-30 – Supports a maximum of 30 IP phones without analog resources. Supports up to 2 analog exts, and 2 LS trunks

SG-50 – Supports a maximum of 50 IP phones without analog resources. Supports up to 2 analog exts, and 4 LS trunks

SG-90 – Supports a maximum of 90 IP phones without analog resources. Supports up to 4 analog exts, and 8 LS trunks

SG-220T1 – Supports a maximum of 220 IP phones without a T1, or 1 T1 with 100 IP phone resources. Supports 0 analog exts, and 0 LS trunks

SG-220T1a – Supports a maximum of 220 IP phones without a T1, or 1 T1 with 70 IP phone resources. Supports 4 analog exts, and 2 LS trunks


Voicemail Switches (Flash RAM for message storage)

SG-50V – Supports a maximum of 50 IP phones without analog resources, 50 voicemail and 22 hours of storage. Supports up to 2 analog exts, and 4 LS trunks

SG-90V – Supports a maximum of 90 IP phones without analog resources, 90 voicemail and 56 hours of storage. Supports up to 4 analog exts, and 8 LS trunks


1U Full Width Switches

SG-120 – Supports a maximum of 120 IP phones without analog resources. Supports up to 16 analog exts, and 8 universal ports. (Universal port can be assigned as 8 analog exts, 8 LS trunks, or 8 analog DID trunks)

SG-24a – Supports a maximum of 24 analog exts, or 4 x 6 make me conferences. Unused analog ports can be assigned make-me conferences


Understanding what consumes the IP resources on the voice switches:

Each analog port assignment on the voice switches consumes 5 IP resources whether that be a analog extension, or CO trunk. (Utilizes a 5 to 1 ratio)

ShoreGear voice switches that support analog ports can be used for the following:

  • IP phones
  • SIP phones
  • SIP proxy
  • SIP trunks
  • Analog phone or FAX extension
  • Analog Trunks
  • Make-Me Conference

There are three voice switch models do NOT support make-me conferences, the SG-30, SG-T1K, and SG-220T1.

There are two voice switch models that do NOT support SIP stations, SIP trunks, or SIP Proxy, the SG-24a and SG-T1K


Do the Math

Analog ports on the voice switches consume IP resources with a 5 to 1 ratio.

For every 1 analog port used, 5 IP resources are unavailable for IP phone allocation on the voice switch.


SG-30 has 2 analog ext, and 2 CO trunks assigned, this leaves the SG-30 capable of supporting 10 IP phones.

With each analog port being used, 4 analog ports consuming 5 IP resources, simply multiply 4 times 5 resulting in 20 IP resources subtracted from the voice switch capability.

SIP Devices, SIP Trunks, SIP Proxy

SIP extensions, trunks, and proxy are assign to analog port resources on the voice switches.

SIP resources also consume 5 IP resources from the voice switches, however the quantity of SIP devices, and trunks are in quantities of 5 per analog allocation.

A SIP proxy will consume 5 IP resources but allow 100 SIP proxies.

SIP devices and trunks follow a 5 to 5 ratio.


SG-50 has 10 SIP trunks and 5 SIP extensions assigned. It will require 20 IP phones resources and take 4 analog ports away from the voice switch.

(Analog ports requires – 2 analog exts, 2 CO trunks)

Each analog port will allow for 5 SIP trunks, thus 2 analog ports multiplied by 5 will consume 10 IP resources. (10 SIP trunks, 5 SIP trunks per analog port)

SIP trunks do NOT require a SIP proxy, only SIP devices require a SIP proxy.

In the scenario above 5 SIP devices will require 1 analog port and consume 5 IP resources.

Since SIP devices also require a SIP proxy, an additional analog port will be used to allocate up to 100 SIP proxies.

Additional SIP devices can be added to analog ports up until the point 100 proxies are consumed, at which time an additional 100 SIP proxies will be required.

The available IP phones resources on the SG-50 will be 30 since the SIP trunks, devices and proxy are consuming 20 IP resources.

I hope you thoroughly enjoyed the math above…

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