Post Dial Delay
Post-dial delay (PDD) is the short period between dialing the last digit of a number and hearing the first audible signal—typically a ringtone or a busy tone. While a brief pause is normal, noticeable or extended silence can indicate a problem in the call setup path.
In VoIP or telephony systems, PDD reflects how quickly signaling messages traverse the network between your dialer, your carrier, and the destination network. A long delay often means that one or more hops in that signaling chain are congested or not responding efficiently.
Common Causes
- Carrier routing latency: Sometimes carriers use multiple hops to connect a call, and one of those routes may be slow.
- SIP or signaling delays: In VoIP environments, Session Initiation Protocol (SIP) messages can experience lag if intermediate servers are overloaded or misconfigured.
- Codec negotiation: Audio codec mismatches or slow negotiation between endpoints can cause silence before the call connects.
- Firewall or NAT traversal: If your network blocks or delays SIP traffic, it can add seconds to call setup time.
How to Troubleshoot
Use the Call Report Tool In the RingDNA Dialer, click Report this Call and categorize the call as Post-Dial Delay.
- Include an estimate of the delay in seconds.
- Mention what you heard (silence, clicks, tones, or partial ring).
- Note whether the delay happens consistently, or only with certain numbers or regions.
Check Your Local Network
- Make sure your internet connection is stable and not saturated by other applications (e.g., video streaming or file uploads).
- If you’re using Wi-Fi, test with a wired connection to rule out wireless interference.
- Restart your router or modem if latency seems unusually high.
Gather Additional Data Submit multiple examples of calls with PDD to help isolate whether the issue is network-wide or specific to certain carriers or regions. Include:
- Timestamps of affected calls.
- The destination numbers and countries.
- Any patterns (e.g., all calls to Europe are delayed, domestic calls are fine).
When to Contact Support
If you continue to experience noticeable post-dial delays after reporting and local troubleshooting, please reach out to our Support team.
When contacting Support:
- Attach or reference any Call Reports you’ve already submitted.
- Describe the severity and frequency of the issue.
- Provide examples from multiple calls if possible.
Persistent post-dial delay typically lies beyond your local network—it’s often tied to carrier routing or signaling between telephony providers. Your reports help our support and carrier teams identify and resolve such issues quickly.