Update sip-telnyx.mdx

Author: sahilsuman933

fern/advanced/sip/sip-telnyx.mdx

@@ -50,9 +50,6 @@ To allow Vapi.ai to make outbound calls through your Telnyx account:
 1. **Set Up Outbound Authentication**
    - Go to Voice / SIP Trunking / Authentication and routing
    - Scroll down to "Outbound calls authentication"
-   - Whitelist Vapi's SIP server IPs:
-     - **44.229.228.186**
-     - **44.238.177.138**
    - Select Tech Prefix and create a new credential for Vapi to use
    <Frame>
      <img src="../../static/images/sip/telynx-outbound-auth.png" />
@@ -153,4 +150,4 @@ curl --location 'https://api.vapi.ai/call/phone' \
 
 Replace all placeholder values with your actual information.
 
-By following these steps, your Telnyx SIP trunk will be fully integrated with Vapi.ai, allowing your AI voice assistants to manage calls effectively.
+By following these steps, your Telnyx SIP trunk will be fully integrated with Vapi.ai, allowing your AI voice assistants to manage calls effectively.