7/31/2023 0 Comments Skype international calls problemsResolution 2Ĭontact your PSTN provider for support to fix the issue. This is most likely the case if the failure error code is SIP 403 or SIP 404. Your PSTN provider is experiencing some issue and is sending the SIP failure message. If you need assistance, contact the device vendor. Troubleshoot the other device to fix the error. The SIP failure message is generated by another telephony device that is on the same network as the SBC. In this situation, when the SBC receives a SIP options message from Teams, it returns a failure message that includes error codes in the range of 400 to 699.Īny of the following causes might prevent a connection to the SBC. Sometimes, calls reach the SBC but no connection is established. To make sure that the correct caller ID is displayed to the call recipient, configure the SBC to either remove the P-Asserted-Identity header from the SIP options message or modify its contents. If the information in the From and P-Asserted-Identity headers doesn't match, and if the Public Switched Telephone Network (PSTN) prioritizes the P-Asserted-Identity header information over the From header information, then incorrect information is displayed. If Privacy:id is set, this indicates that the information in the header has to be hidden from the call recipient. The P-Asserted-Identity header contains the phone number of the user who is billed for the call. The phone number of the original caller if the call was forwarded.A service number that is assigned to the caller by using the CsCallingLineIdentity cmdlet.If the caller's phone number has to be hidden from the call recipient, it's replaced with "anonymous". The phone number that's assigned to the caller who is initiating the call.The From header contains any of the following items: When you use Direct Routing, the caller ID information that is delivered to the call recipient is listed in the From and P-Asserted-Identity headers in the Session Initiation Protocol (SIP) options message. Incorrect caller ID displayed to the recipient This article discusses potential causes of these issues, and provides resolutions that you can try. No users in a tenant are able to make calls.Some users in a tenant are unable to make calls. A connection to the SBC is not established.An incorrect caller ID is displayed to the call recipient.You might experience various issues when you use Direct Routing to make outbound calls from a Microsoft Teams client to a Session Border Controller (SBC).
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