SIP Proxy Resource Calculator

Basic Configuration Help

Basic Configuration Settings

This section of the SIP Resource Calculator applies to all standard/basic Hosted VoIP configurations. The fields marked with “*” are required in order for the tool to work correctly.

Phone Count

This is the total number of phones that will reside behind the ADTRAN Proxy. This number should represent the total number of phones at this site.

Number of Phones in Use at once

This number should represent an estimate as to the number of phones that will be in use at once. This estimate should consider both internal and external calls, NOT external calls only. In smaller deployments (25 phones or less), this estimate is roughly 60% of total phone count. For larger deployments, this number should represent approximately 30-40% of the total phone count. In Call Center deployments, this number will be much higher.

Number of BLF Buttons

This number should represent an estimate as to the total number of BLF (Busy Lamp Field) buttons configured on ALL phones. For example, if you have 25-phones deployed and all of these phones will have approx.5-BLF buttons configured on each, then the total number of BLF buttons is 125. If BLF is NOT configured on any phones this field should be set to “0”.

Registration Timer Expiry

This is a configured value on the carrier’s softswitch or PBX, so this information is provided by the service provider or IP PBX technician. If this value is unknown, use the default “60s” Registration Timer as a worst case scenario.

Phone Count *
Number of phones in use at once *
Number of BLF Buttons
Registration Timer *
* Required
Advanced Configuration Help

Advanced Configuration Settings

The advanced feature settings below only apply to deployments with All Ring Groups or SLA/SCA (Shared Line Appearance or Shared Call Appearance) configured. These configurations require the greatest number of SIP transaction resources and should be as close to accurate as possible. If these Advanced Configuration settings don’t apply to your Hosted VoIP deployment, fields should be left at default “0”.

All-Ring or SLA/SCA Groups

In most cases, when deploying an “All Ring” Group (meaning a single number rings multiple phones simultaneously), or SLA/SCA (a single line configured on multiple phones that rings simultaneously), you will often have multiple groups of phones. If multiple groups are required in your application, you’ll need to define each group separately. (Note: This tool will allow you to enter up to 5 separate groups, (Group 1 - Group 5).

Number of Phones in All Ring or SLA Group

This is where you will define the number of phones assigned to a single number ring group, or the number of phones configured with Shared Line Appearances/Shared Call Appearances. (Note: Think of SLA/SCA as the old Key System (Square Key) mode of operation, in which users have the same incoming/outgoing line appearances configured on multiple phones, (e.g. Line 1, Line2. Line 3, etc.)

Number of Phones w/Full Mesh BLF Configured

Only applies to phones within this group that have BLF (Busy Lamp Field) buttons of other group members configured on their phones. If NO BLF is configured within this group, leave this field as “0”.

Simultaneous Inbound Calls to Group

Please estimate the number of “simultaneous” inbound calls to this group. This applies to both Ring Group & SLA groups, with the minimum number being “1”. (Note: Simultaneous calls entered here are subtracted from the "Total Number of Phones in use" in the final calculation.

Required number of SIP Transaction Resources

This field provides you the total number of SIP Transaction resources required for your configuration. With this number, you can then go to the AOS Feature Matrix to locate a Product that exceeds the SIP Transaction Resources calculated in this field.

All-Ring orSLA Group Number of Phones in Group Number of Phones In Group w/Full Mesh BLF Simultaneous Inbound Calls to Group SIP Transactions
Group 1
Group 2
Group 3
Group 4
Group 5
Required Number of SIP Transaction Resources
DISCLAIMER: The ADTRAN SIP Proxy Resource Calculator is only an estimate to the number of SIP resources required for a particular application. The calculation assumes SIP D & J timers are set to 4000ms (4s), the default setting is 32,000ms (32s) in all ADTRAN products.
For a complete listing of SIP transaction resources by product, refer to the AOS Feature Matrix.