Please be aware of the following planned change.

Start Date and Time: Thu, Jul 03 2025 07:30 AM  (BST)

End Date and Time:   Thu, Jul 03 2025 11:30 AM (BST)

• Duration: 4 Hour(s) 0 Minute(s)

Customer Impact: All AT&T APNs 

Required Action: User action may be required.

• Customers who are not using configured allow lists for their Internet-facing APNs have no further action items.
• Cisco is re-using an existing range; however, customers who are already using allowlists for their Internet-facing APNs will want to verify they are already allowing the following IP range:
  • 204.156.180.32 - 204.156.180.63

Impact on Customer Operation:

• During this planned Maintenance Window, a manual flush of data sessions will be required.
• With redundancy in place, any new data sessions can be re-established immediately on alternate PGW, depending on timing of device side retry mechanism. This will create a small blip in data sessions.
• In most cases, devices will automatically reconnect or attempt to establish a new session.
• However, depending on individual device configurations or software, some devices may require a manual restart.

Please note that the maintenance will take place during the times specified in British Summer Time (BST)

We apologise for any inconvenience that this may cause, and we thank you for your patience.

Kind regards,

Customer Engagement Team

 If you have any concerns or queries, please contact the Customer Engagement Team using the following details: +44 (0) 1279 799270 or support@arkessa.com and quote ticket reference #1992751.