# 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