This section applies in the case where the Rhino VoLTE TAS SGC received its initial configuration on a VM version less than or equal to 4.0.0-22-1.0.0 or was most recently reconfigured following the SGC reconfiguration procedure on a VM with version less than or equal to 4.0.0-22-1.0.0.

If the VM is part of a new deployment with VM version greater than or equal to 4.0.0-23-1.0.0 this section does not apply.

Overview

Previous VM releases have contained defects that resulted in some SGC configuration parameter values being applied incorrectly. Multiple subsequent VM releases have contained fixes for these defects and configuration is now correctly applied.

VMs retain their pre-existing SGC configuration during upgrade. This means that VMs that were initially configured using a release with the configuration defects, that were then upgraded, still retain the defective configuration. This ensures that upgrades don’t fail due to changes in how configuration is interpreted.

However, this MOP takes the SGC back to an unconfigured state, and then applies the new configuration. This means that there is a possibility that configuration parameters subject to the defect may be applied differently (correctly) compared with previously (incorrectly), resulting in the SGC behaving differently.

In some cases the difference in behavior can mean a loss of service.

Generally, this is only likely to be a problem when both:

  • The configuration YAML contains an error that sets an integer field to 0 that should have been omitted or set to null.

  • The VM configuration defect treats 0 as being absent or null, when it should be treating it as an actual 0.

The two together result in the VM exhibiting the behavior of a null or absent value.

Once the VM configuration defect is rectified and the VM reconfigured, the 0 will be treated as a 0.

To avoid this, follow these instructions to review the configuration.

Reviewing the configuration

It is strongly recommended that the existing configuration is reviewed and thoroughly tested prior to executing this MOP on the live site.

Steps to carry out:

  1. Examine m3ua configuration for any integer parameter values that are currently set to 0. Determine if and how this parameter is affected by configuration defects by consulting the table below.

    1. If you wish to implement the correct behavior then no further action is required. Do not carry out the operation in the action to retain incorrect behavior column.

    2. If you wish to retain the previous incorrect behavior, apply the action documented in the action to retain incorrect behavior column.

    3. If the parameter is not documented in this table, check that it is an integer value, and that 0 is a permitted value. Only integer values are affected. Contact support for further advice.

  2. precond-ssns were not applied prior to version 4.0.0-18-1.0.0, regardless of their value. To retain that behavior, delete all precond-ssns elements. To obtain the corrected behavior leave them configured as-is.

The configuration parameters that don’t correctly honor a value of 0 are:

Fixed in Parameter name Incorrect behavior Correct behavior Action to retain incorrect behavior

4.0.0-10-1.0.0

rewriters: gti

rewriter does not set gti

rewriter sets gti to 0

Remove the parameter and its value.

4.0.0-10-1.0.0

rewriters: gtencoding

rewriter does not set gtencoding

rewriter sets gtencoding to 0

Remove the parameter and its value.

4.0.0-10-1.0.0

rewriters: natofaddr

rewriter does not set natofaddr

rewriter sets natofaddr to 0

Remove the parameter and its value.

4.0.0-10-1.0.0

rewriters: numplan

rewriter does not set numplan

rewriter sets numplan to 0

Remove the parameter and its value.

4.0.0-10-1.0.0

rewriters: trtype

rewriter does not set trtype

rewriter sets trtype to 0

Remove the parameter and its value.

4.0.0-10-1.0.0

matchers: rules: natofaddr

matcher may match on configured defaults if use-defaults is set, or accept any natofaddr value

matcher will only match a natofaddr of 0

Remove the parameter and its value.

4.0.0-10-1.0.0

matchers: rules: numplan

matcher may match on configured defaults if use-defaults is set, or accept any numplan value

matcher will only match a numplan of 0

Remove the parameter and its value.

4.0.0-10-1.0.0

matchers: rules: trtype

matcher may match on configured defaults if use-defaults is set, or accept any trtype value

matcher will only match a trtype of 0

Remove the parameter and its value.

4.0.0-10-1.0.0

translations: priority

Initconf did not converge.

Initconf will converge, and the priority will be set to 0.

N/A

4.0.0-10-1.0.0

inbound: natofaddr

inbound rule will match any natofaddr value

inbound rule will only match a natofaddr of 0

Remove the parameter and its value.

4.0.0-10-1.0.0

inbound: numplan

inbound rule will match any numplan value

inbound rule will only match a numplan of 0

Remove the parameter and its value.

4.0.0-10-1.0.0

inbound: trtype

inbound rule will match any trtype value

inbound rule will only match a trtype of 0

Remove the parameter and its value.

4.0.0-10-1.0.0

remote: peers: asp-id

ASP management messages will be sent without an asp-id parameter

ASP management messages will be sent with the asp-id parameter set to 0. If this was previously working, it is likely that this will result in failure to communicate properly with the remote peer unless the remote peer is also configured to use an asp-id of 0.

Remove the parameter and its value.

4.0.0-10-1.0.0 and 4.0.0-23-1.0.0

dpc: network-appearance

the network-appearance parameter is set to null. This impacts the DAUD/DAVA/DUNA messages used to share information about an AS between peers. An incorrect setting may result in a network outage.

the network-appearance parameter is set to 0

Remove the parameter and its value.

4.0.0-10-1.0.0 and 4.0.0-23-1.0.0

routes: dpc-ids: priority

the routes: default-priority will be used to configure the route. This may result in the route having a lower than expected priority.

The route will be configured with a priority of 0 (the highest).

Remove the parameter and its value.
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Rhino VoLTE TAS Version 4.1