Transcribe a long μ-law telephony file G.711 calls and call logs.
A long μ-law telephony file is 8 kHz audio at 64 kbps, about 29 MB an hour, so even a 10-hour call log is under 300 MB and fits the upload box on this page. It transcribes at about 2 minutes per audio hour; the first 20 minutes are free, and an 8-hour day of calls, 480 minutes, fits the $6 pack of 500.
μ-law, explained
The telephone network's own audio format: small, narrow and perfectly good for speech.
Who writes μ-law
G.711 μ-law is the standard phone codec in North America and Japan. Office phone systems, call recorders, voicemail servers and VoIP platforms store calls in it, and a saved RTP stream from a network capture is often μ-law too. You will meet it as raw .ul, .ulaw or .mu files, or inside a WAV or AU file.
The size, worked out
8,000 samples a second at 8 bits each is 64 kbps, or 8,000 bytes a second: about 28.8 MB an hour. Ten hours is about 288 MB, under the 500 MB the box on this page takes and nowhere near 2 GB. A two-channel recording, caller on one side and agent on the other, doubles that to about 58 MB an hour.
Raw files need one command
A WAV or AU with μ-law inside usually uploads as it is. A raw .ul file has no header, so nothing tells the software what it holds. If the upload refuses it, convert to MP3 or MP4 with ffmpeg or VLC. With ffmpeg the rate must be stated: ffmpeg -f mulaw -ar 8000 -ac 1 -i call.ul call.mp3. Files over 500 MB continue on upload page.
A day of calls, sorted
A long call file comes back with a brief, chapters where the calls or topics change, the account numbers, dates and amounts said aloud, the questions the calls answered, and a chat to find the moment a customer asked for something. Callers and agents are identified and named in the summary, key quotes and chapters.
Why call audio sits unread
Every call is recorded. Almost none of them is ever listened to again.
✗ A folder of .ul files
The phone system keeps everything in a format nothing on the desktop opens.
- Media players that refuse raw μ-law
- Calls found only by date and extension
- Complaints checked by listening in real time
- Tools that cap uploads at a few minutes
- Per-seat software for an occasional audit
- No summary of a day's calls
✓ Calls you can read
Convert once if needed, upload, and search the day in text.
- 8 hours of calls in about 16 minutes
- Account numbers listed in the brief
- Speakers named in the summary
- Moments found by timestamp
- $6 for 500 minutes
- Five export formats
Sample
Part of a long call recording, as text.
Illustrative only: written for this page. No real caller, company or account appears in it.
Export
One transcript. Five clean formats.
Every pack exports all five — no format is held back for a higher tier.
Plain text
De-ummed paragraphs. Ready to paste.
SRT captions
Timed to the speech. Every video editor reads this.
WebVTT
HTML5 player + YouTube uploads.
Show notes
Formatted with chapters and pull-quotes.
Machine-readable
Timestamped text for your own tools.
Pricing
Honest pricing, no surprises.
A pack from $6 (500 minutes) opens the full transcript. After that, no subscription and no auto-renew — every tier is a one-time minute pack, and credits never expire. Buy once, use the minutes whenever you need them.
Casual pack
$6/500 min
8 hours of audio — $0.72 an hour. One-time — credits never expire.
- 500 minutes of audio
- All export formats
- AI chat over the whole transcript
- Executive summary & key quote
Best value
$12/2,000 min
33 hours of audio — $0.36 an hour. Credits never expire.
- 2,000 minutes of audio
- Summary, chapters and key quotes
- All export formats
- AI chat over the whole transcript
Bulk pack
$24/5,000 min
83 hours of audio — $0.29 an hour. Credits never expire.
- 5,000 minutes of audio
- Summary, chapters and key quotes
- API access for batch pipelines
- All export formats
FAQ
Long μ-law files, the common questions.
Will a μ-law file upload as it is?
A WAV or AU file with μ-law audio usually does. A raw .ul or .ulaw file often does not, because it has no header and some pickers do not see it as audio. Convert it with ffmpeg or VLC first, stating 8 kHz and one channel.
How long does a long call file take?
About 2 minutes per audio hour. A 4-hour file is ready in around 8 minutes and a 10-hour one in about 20.
What does a week of calls cost?
Five six-hour days, 1,800 minutes, fit the $12 pack of 2,000. A month of selected calls of about 4,500 minutes fits the $24 pack of 5,000. On a first visit the first 20 minutes are free, and packs never expire.
Should I upload calls one by one or joined?
Either works. Joining a day of short calls into one file gives one transcript and one brief for the day; single calls give one transcript each. Keep each file under 10 hours.
Is 8 kHz audio good enough?
It is narrowband, but it is what the phone network carries and speech transcribes well from it. Converting to a higher sample rate adds nothing; leave it at 8 kHz. Recording a call needs the consent the law where you are requires.
Which languages, and where are calls processed?
99 languages are detected automatically. Recordings are transcribed on our own servers and are never used for training. Downloads come as TXT, DOCX, SRT, VTT and JSON.
Related
Other telephony formats
Upload the call audio. Read the day instead of replaying it.
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