# List of the common issues submitted by the partners * **Ghost calls** - These are typically calls that only appear on the phone and do not register as calls within the VoIP server itself. (sometimes displayed as odd numbers like 0000)\ \ To resolve this issue please ensure that the below parameters are enabled or disabled depending on what hardware you are using **Yealink** Accept SIP Trust Server Only: ENABLED \ Allow IP Calls: DISABLED **Grandstream GXP/GRP models** Disable Direct IP Call: ENABLED \ Accept SIP Trust Server Only: ENABLED **Grandstream WP820** Only Accept SIP Requests from Known Servers: ENABLED \ Check SIP User ID for Incoming INVITE: ENABLED * **Specific extension unable to make outbound calls but can receive incoming calls -** This is due to recent changes imposed by ACMA on CallerIDs to reduce the spam calls. They restricted the use of Anonymous caller ID and a special number To mitigate the issue please ensure you have assigned a DID for the extension in VOIPnow or check if you configure the below parameters for outbound caller ID under "Phone Terminal Setup" Note: you need to use a valid DID on these parameters e.g 0289998000 CallerID name in public calls CallerID number in public calls * **Unable to make outbound and inbound calls through Teams (issue wrong DID format)** To resolve this, please ensure that you have correctly executed the commands from our KB article on how to assign a DID to a Teams Tenants. Basically, you need to remove the 0 and use the +61 only e.g. +61289998000 --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://kb.hostednetwork.com.au/support/services/voice-over-ip-voip/general/voipnow-guides/list-of-the-common-issues-submitted-by-the-partners.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.