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Outbound Transport Changing
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9
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26
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October 10, 2026
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Subject: Panama (+507) — Inbound-Only SIP Trunking and KYC Verification
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1
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12
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October 10, 2026
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Inbound calls to +15735493984 not connecting — silence, nothing in Call History
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1
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7
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October 10, 2026
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Dashboard webhook Test hangs and sends no request
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6
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22
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October 9, 2026
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How to configure stable multilingual agents (IT/EN/ES/FR/DE) with 2–3 languages per agent?
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2
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249
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October 8, 2026
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URGENT: I accidentally deleted a Retell (Issued by Twilio) number and need to recover it
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11
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32
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October 6, 2026
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Single Prompt agent transfer_call not working
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28
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238
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October 6, 2026
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Phone Number Connection
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1
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13
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October 5, 2026
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No ringback tone to the caller during cold transfer (SIP REFER) since migration from legacy LiveKit SIP endpoint to sip.retellai.com
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2
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25
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October 2, 2026
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Inbound DID matching appears to use the To header rather than the Request-URI — transferred calls rejected as "Unknown Number"
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11
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67
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October 2, 2026
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Transfers from Retell-purchased number fail in ~4s without dialing (agentic + plain warm)
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7
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47
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October 1, 2026
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External SIP leg remains connected ~16–18 seconds after voicemail detection
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2
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30
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October 1, 2026
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Enable outbound calling to Netherlands (+31)
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1
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15
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September 29, 2026
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KYC blocked after repeated "image too blurry" retries
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2
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21
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September 28, 2026
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Retell AI — SIP 486 Rejected on inbound calls
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1
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14
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September 25, 2026
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Knowledge Base File Upload functionality (/file endpoint) that we are using in VAPI
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3
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27
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September 21, 2026
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Outbound calls to Poland (+48) using Retell-managed numbers: support and pricing
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1
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16
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September 21, 2026
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I have a retell account and a twilio acccount, how to integrate twilio to retell?
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3
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54
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September 21, 2026
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Audible tone during cold transfer sounds like a dropped call — began within the last week
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7
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70
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September 16, 2026
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Harsh static/noise at beginning of calls when Background Sound is enabled
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12
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94
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September 15, 2026
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Voicemail Not Working
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1
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23
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September 14, 2026
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Urgent: Accidentally deleted Retell-purchased Twilio number
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6
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35
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September 9, 2026
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Agent not able to hear caller
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10
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75
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September 9, 2026
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Outbound calls failing — permission_denied then SIP 408 timeout on custom SIP trunk
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1
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25
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September 8, 2026
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One way audio from the voice agent - telephony
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11
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98
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September 8, 2026
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Custom SIP outbound: static egress IP and Retell-issued SIP credentials
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1
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20
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September 8, 2026
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All BYOC SIP-trunk inbound calls drop ~0.4s after answer since Sep 6 — gateway on 18.98.16.121 now rejects every mid-dialog re-INVITE with 486
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2
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30
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September 7, 2026
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UAE outbound calls blocked with Telnyx BYOT - Call country not supported: AE
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9
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45
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September 7, 2026
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I'm having an issue purchasing a phone number. My card information is on file and my identity been verfied
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1
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20
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September 7, 2026
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Enable outbound calls to Colombia (+57)
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1
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23
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September 5, 2026
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