WebRTC Call Analysis Summary 🔗

Executive Summary 🔗

This document provides a comprehensive analysis of 5 WebRTC call attempts analyzed using automated diagnostic tools. The analysis reveals a 20% success rate with significant device switching issues and ICE connectivity failures.

Key Metrics:

• Total Calls Analyzed: 5
• Successful: 1 (20%)
• Failed: 3 (60%)
• Disconnected: 1 (20%)
• Total getUserMedia Calls: 114
• Total Rapid Device Switches: 52

Individual Call Analysis 🔗

Call 1: 3162189.txt - ❌ FAILED 🔗

Duration: 2025-06-27 10:01:56 - 10:35:13
Device: Plantronics Savi 8200 UC Series
Final State: failed

Technical Details: 🔗

• getUserMedia Calls: 41
• Device Switches: 25 (18 rapid)
• Connection Attempts: 1
• Success Rate: 0%
• Media Quality Score: 50/100

SDP Exchange: 🔗

Remote SDP (Offer):

• Origin: o=- 1750990585 1750990586 IN IP4 127.0.0.1
• Media: m=audio 18762 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 4.184.162.243

• Codecs Offered:

• PT 9: G722/8000

• PT 8: PCMA/8000
• PT 0: PCMU/8000

• ICE Candidates:

• Host: 1 (172.31.250.17:18762)

• STUN: 1 (4.184.162.243:18762)

Local SDP (Answer):

• Origin: o=- 5891426401832296382 2 IN IP4 127.0.0.1
• Media: m=audio 43686 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 72.144.0.9

• ICE Candidates:

• Host: 2

• STUN: 1 (217.6.85.6:51431)
• TURN: 2 (72.144.0.9:43686, 72.144.0.9:28366)

Media Statistics: 🔗

• Audio Duration: 6192.1s
• Packet Loss: 1788 packets
• Jitter: avg 6553369400.3ms, max 67123840000.0ms (measurement anomaly)

Issues Detected: 🔗

1. Excessive rapid device switching: 18 switches within 5 seconds
2. ICE connection failure: "No local candidates" error
3. High packet loss: 1788 packets

Call 2: 3162441.txt - ⚠️ DISCONNECTED 🔗

Duration: 2025-06-27 10:41:26 - 11:05:32
Device: Jabra Link 380
Final State: disconnected

Technical Details: 🔗

• getUserMedia Calls: 60
• Device Switches: 41 (31 rapid)
• Connection Attempts: 0 reported
• Media Quality Score: 50/100

SDP Exchange: 🔗

Remote SDP (Offer):

• Origin: o=- 1750987895 1750987896 IN IP4 127.0.0.1
• Media: m=audio 16412 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 4.184.162.243

• ICE Candidates:

• Host: 1 (172.31.250.17:16412)

• STUN: 1 (4.184.162.243:16412)

Local SDP (Answer):

• Origin: o=- 2461596927021834458 2 IN IP4 127.0.0.1
• Media: m=audio 20438 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 72.144.0.9

• ICE Candidates:

• Host: 2

• STUN: 1 (217.6.85.3:54832)
• TURN: 2 (72.144.0.9:20438, 72.144.0.9:42961)

Selected Candidates: 🔗

• Local: relay - 72.144.0.9 (TURN)
• Remote: srflx - 4.184.162.243 (STUN)
• Candidate pair changes: 2

Media Statistics: 🔗

• Audio Duration: 13132.5s
• Packet Loss: 3276 packets
• Jitter: avg 19247181025.8ms, max 204329280000.0ms (measurement anomaly)

Issues Detected: 🔗

1. Extreme device switching: 31 rapid switches
2. Connection via TURN relay disconnected
3. High packet loss: 3276 packets

Call 3: 3162629.txt - ❌ FAILED 🔗

Duration: 2025-06-27 10:34:27 - 11:31:45
Device: Jabra Link 380
Final State: failed

Technical Details: 🔗

• getUserMedia Calls: 4
• Device Switches: 1 (1 rapid)
• Connection Attempts: 1
• Success Rate: 0%
• Media Quality Score: 50/100

SDP Exchange: 🔗

Remote SDP (Offer):

• Origin: o=- 1750992210 1750992211 IN IP4 127.0.0.1
• Session Name: Not specified
• Media: m=audio 11094 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 4.182.64.168
• ice-ufrag: WgufiMwXjubsd4Gx

• ICE Candidates:

• Host: 1 (172.31.250.41:11094)

• STUN: 1 (4.182.64.168:11094)

Local SDP (Answer):

• Origin: o=- 1529107016431903462 2 IN IP4 127.0.0.1
• Media: m=audio 29396 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 72.144.0.6

• ICE Candidates:

• Host: 2

• STUN: 1 (217.6.85.40:52541)
• TURN: 2 (72.144.0.6:29396, 72.144.0.6:43430)

Media Statistics: 🔗

• Audio Duration: 15285.3s
• Packet Loss: 4850 packets
• Jitter: avg 19048456527.5ms, max 195485440000.0ms (measurement anomaly)

Issues Detected: 🔗

1. ICE connection failure: "No local candidates" error
2. High packet loss: 4850 packets
3. Minimal device switching but still failed

Call 4: 3162734.txt - ✅ SUCCESSFUL 🔗

Duration: 2025-06-27 11:41:11 - 12:08:32
Device: Jabra EVOLVE LINK
Final State: connected

Technical Details: 🔗

• getUserMedia Calls: 5
• Device Switches: 1
• Connection Attempts: 1
• Success Rate: 100%
• Media Quality Score: 50/100

SDP Exchange: 🔗

Remote SDP (Offer):

• Origin: o=FreeSWITCH 1751003564 1751003565 IN IP4 4.182.64.167
• Session Name: s=FreeSWITCH
• Media: m=audio 14156 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 4.182.64.167

• Additional attributes:

• a=silenceSupp:off - - - -

• a=ptime:20

• ICE Candidates:

• Host: 1 (172.31.250.44:14156)

• STUN: 1 (4.182.64.167:14156)

Local SDP (Answer):

• Origin: o=- 7141636909246153696 2 IN IP4 127.0.0.1
• Session Name: s=-
• Media: m=audio 9 RTP/SAVPF 9 8 0
• Connection: c=IN IP4 0.0.0.0

Selected Candidates: 🔗

• Local: srflx - 217.6.85.37:49933
• Remote: srflx - 4.182.64.167:14156
• Connection Type: STUN (server reflexive)
• Candidate pair changes: 1

Codec Information: 🔗

• Negotiated Codec: G722/8000 (PT: 9)
• MIME Type: audio/G722

Media Statistics: 🔗

• Bytes Sent: 13,944,250
• Bytes Received: 0
• Packets Sent: 82,025
• Packets Received: 0
• Packet Loss: 604 packets (0.74%)

• Jitter by Direction:

• Inbound (received audio): avg 0.6ms, max 3.0ms

• Outbound (sent audio): avg 0.4ms, max 9.6ms
• RTT: avg 306.94ms, max 1597.00ms
• Average Audio Level: 0.0432

Success Factors: 🔗

• Minimal device switching (only 5 getUserMedia calls)
• Direct STUN connectivity
• Different device (EVOLVE LINK) without enumeration issues

Call 5: 3162756.txt - ❌ FAILED 🔗

Duration: 2025-06-27 10:34:27 - 11:38:27
Device: Jabra Link 380
Final State: failed

Technical Details: 🔗

• getUserMedia Calls: 4
• Device Switches: 1 (1 rapid)
• Connection Attempts: 1
• Success Rate: 0%
• Media Quality Score: 50/100

SDP Exchange: 🔗

Note: Identical remote SDP to Call 3 (same ice-ufrag: WgufiMwXjubsd4Gx) - Same fingerprint and session parameters - Appears to be a retry of Call 3

Media Statistics: 🔗

• Audio Duration: 16056.3s
• Packet Loss: 8375 packets (highest of all calls)
• Jitter: avg 19048456527.5ms, max 195485440000.0ms (measurement anomaly)

Issues Detected: 🔗

1. ICE connection failure: "No local candidates" error
2. Highest packet loss: 8375 packets
3. Appears to be automatic retry of failed Call 3

Aggregate Analysis 🔗

Device Switching Patterns 🔗

ICE Connectivity Results 🔗

Network Configuration 🔗

TURN Servers:

• spr-prod.turn.signalwire.com:443
• spr-prod.turn.signalwire.com:443?transport=tcp

IP Ranges:

• Local clients: 10.x.x.x (private NAT)
• Public IPs via STUN: 217.6.85.x
• Remote servers: 4.182.64.x, 4.184.162.x
• TURN relay IPs: 72.144.0.x

Common Failure Indicators 🔗

1. Device Enumeration Conflicts:

2. "Standard - [Device]" vs "[Device]" naming

3. Rapid switching between identical devices

4. Flip-flop patterns disrupting connection

5. ICE Negotiation Failures:

6. "No local candidates" error despite having candidates

7. Failures immediately after SDP exchange

8. No candidate pair selection

9. Media Quality Issues:

10. Packet loss in all calls (604 - 8375 packets)

11. Jitter measurements show anomalies during failures
12. No received bytes in successful call (one-way audio)

Key Findings 🔗

1. Primary Issue: Device switching feedback loop
2. 52 rapid switches across 5 calls
3. Switching intervals as low as 0.1 seconds

4. Strong correlation with connection failures

5. Secondary Issue: TURN server reliability

6. Only one call used TURN relay
7. Disconnected after establishing connection

8. May indicate authentication or timeout issues

9. Success Pattern:

10. Minimal device switching (5 calls)

11. Direct STUN connectivity
12. Different device without enumeration issues

13. Connection to FreeSWITCH server

14. Codec Behavior:

15. All calls negotiate G722/8000 as preferred codec

16. Successful call confirms G722 usage

17. No transcoding issues observed

18. Network Quality:

19. Actual network jitter is excellent (<10ms)

20. Extreme jitter values are measurement artifacts
21. RTT acceptable for VoIP (avg 307ms)

Recommendations Based on Data 🔗

1. Device Management:

2. Implement device label normalization

3. Add switching debounce mechanism

4. Cache MediaStream objects

5. Connection Reliability:

6. Investigate TURN server timeout settings

7. Implement ICE restart on failures

8. Add connection state monitoring

9. Debugging:

10. Enable verbose ICE logging

11. Monitor device enumeration events

12. Track getUserMedia timing

13. Infrastructure:

14. Test alternative TURN servers

15. Verify firewall rules for WebRTC
16. Consider forcing TURN for problematic networks

Analysis performed on 2025-06-28 using WebRTC diagnostic tools