A guide to phone error messages
While using KrispCall, you may encounter various error messages depending on the action you perform. Some of these can be easily resolved on your end, while others may require assistance from our support team.
To make you more familiar with the different errors and what they mean, we have listed some of the most common mistakes for your quick overview:
Error | Category | Description | Possible Cause | Possible Solution |
|---|---|---|---|---|
Geographic permission not enabled | Call/SMS | You attempted to make an outbound phone call or SMS to a number that is not enabled on your account. | The user may have dialed or texted a destination that has not been enabled to support calling or texting. | Please contact our support team to verify your permissions and resolve the issue. |
Invalid Phone Number | Call | The destination number the user tried to call is invalid. | The request failed because the downstream provider flagged the phone number as invalid, despite it being in the correct format. This may occur if the number is deactivated, suspended, unreachable, used fraudulently, or simply invalid. | First, check if the phone number is correct. Then, retry verifying the number by making a call using a non-VoIP number. |
Account not allowed to call {Phone number} | Call | The carrier has blocked the destination number. | The carrier blacklists the number you're trying to call. This could be due to:High fraud risk at the destination. Regulatory restrictions are preventing the call. | If you need to or want to use this number legitimately, please contact our support team to confirm if it can be whitelisted. |
Workspace channel not found | Call/SMS | You don't have any numbers in this workspace | The user doesn't have any channels assigned | At least one channel must be assigned to the User |
Dialer invalid contact name | Call/SMS | Choose an existing contact or dial | Invalid contact name input in the widget dialer | Select a valid contact from the auto-suggestion in the widget dialer |
Dialer invalid phone number | Call/SMS | Invalid phone number | Invalid phone number input in the widget dialer | Input a valid phone number in the dialer |
Dialer emergency numbers | Call/SMS | For emergency calls, contact support | Emergency phone numbers are input into the widget dialer | Emergency phone numbers are not allowed |
Dialer mic permission | Call/SMS | Permission is needed for the microphone | Microphone permission not granted in the browser. Incompatible Browser. Issue with the microphone device. Issue in the integrated Twilio SDK. | Grant the microphone permission in the browser. Try another browser. Check the microphone device used. Contact the technical support team. |
INTL call sms disabled | Call/SMS | International Calls and Messages Disabled | The international calls and messages setting is disabled in the number settings. Unable to fetch the number settings config from the API | Check the number settings for international calls and sms toggle option. Contact the technical support team if the error persists, even if the setting is enabled |
Self-assigned dialing number | Call/SMS | A number is assigned to one of your channels | Dialing number and assigned channel phone number are the same | Dialing number and assigned number should not be the same |
Call not supported | Call/SMS | Call not supported | The dialing channel (Agent's Number) doesn't have call capabilities. | Need to use the channel with call abilities. |
Self-assigned dialing number | Call/SMS | A number is assigned to one of your channels | Dialing channel (Agent's Number) doesn't have call abilities | Need to use the channel with call abilities |
Device offline | Call/SMS | The device is offline | Internet Connection issue. Unable to initialize Twilio SDK device, or Twilio device is inactive. Error from Twilio SDK. Unable to fetch Twilio voice token | Check the internet connection. Check Twilio sub-account status. Contact the technical support team |
UDP traffic blocked | Call/SMS | Call not supported. Some third-party tools might be affecting your network connectivity. | VPN installed. Some installed VPN apps or Chrome extensions (like Pure VPN) block UDP traffic. Any other Chrome extension that blocks UDP traffic. It may also be necessary to check the user's Internet service provider (ISP). | Uninstall the VPN app or Chrome extensions that block UDP traffic, like Pure VPN. Contact the technical support team. |
Workspace suspended | Call/SMS | Your KrispCall Account is currently suspended due to a lack of credits | Workspace credit is less than $0.2 | The user needs to have more than $0.2 credit balance in the workspace |
Power dialer credit low notification | Power Dialer | Your credit is low! Please recharge soon to avoid service interruptions. | The credit Amount is less than $1 during powerdialer calls | The Credit Amount should be greater than $1 |
Power dialer call disconnect low credit | Power Dialer | Call disconnected. Your credit is low! | Credit Amount is less than 0.5 | Credit Amount should be greater than $0.5 |
Hence, these are some of the phone error messages you may encounter when using KrispCall. You should be able to navigate through these error messages by implementing the provided solutions. However, if the error message persists, please do not hesitate to contact our support team at support@krispcall.com. We are here to help always.
Updated on: 28/07/2025
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