When you need an interpreter, the first practical question is often not “who?” but “how?”. Should the interpreter join by phone, appear on screen or come to the room? Each format has real strengths. The mistake is to choose by habit or convenience alone. This guide sets out a simple way to decide, drawing on our own experience of arranging all three and on what our vetted, trained and qualified interpreters see in their daily work.
Start with the conversation, not the technology
Before choosing a format, ask four questions about the conversation itself:
- What is at stake? Would a misunderstanding affect someone’s health, liberty, safety, immigration status or legal rights?
- How complex is it? Will there be technical terms, documents to read, or several people speaking?
- Who is taking part? Are there children, people in distress, people with hearing loss, learning disabilities or mental health conditions?
- How long and how urgent is it? A two-minute call to rearrange an appointment is very different from a two-hour assessment.
The answers usually point clearly to one format. When they pull in different directions, risk should win over convenience.
Telephone interpreting (OPI)
In telephone interpreting, the interpreter joins as a third party on a call. Everyone may be in different places, or the professional and the client may sit together with a speakerphone.
Where it works well: short, structured or routine conversations; urgent calls where any delay matters; first contact, triage and appointment arrangements; out-of-hours situations. It can be available within moments, at any time of day, in a very wide range of languages, which makes it a natural channel for routine appointments as well as emergencies.
Where it struggles: the interpreter cannot see facial expressions, gestures, documents or who is about to speak. Long, emotional or multi-party conversations are harder to manage, and sound quality becomes critical. Telephone interpreting is not possible for sign languages.
Video remote interpreting (VRI)
With video interpreting, the interpreter joins by a secure video link, so participants and interpreter can see each other.
Where it works well: conversations where visual information matters but on-site attendance is impractical: participants in different places, short-notice bookings, rarer languages where the nearest interpreter is far away, and sign language interpreting when an on-site interpreter is not available. In remote interviews where credibility and detail matter, such as asylum interviews, video is usually preferable to audio alone so that the interpreter can be seen.
Where to be careful: video adds technology that can fail, and it changes how people interact. Interpreters working over video links tire faster than on site, and poor sound or a frozen picture can cause problems that would not arise in the room, especially in long legal hearings. The practical lessons are clear: test the connection beforehand, use good microphones and cameras, make sure the interpreter can see and hear every speaker, and plan breaks for longer sessions.
Face-to-face interpreting
An on-site interpreter is physically present, usually interpreting consecutively, or whispering simultaneously to one or two listeners in settings such as court hearings.
Where it works well: complex, sensitive or high-risk conversations; people who are distressed, unwell, very young or elderly; people with hearing, speech or cognitive difficulties; multi-party meetings, examinations and hearings; any situation where trust and rapport are central. In healthcare, face-to-face interpreting should be the first choice for higher-risk clinical conversations.
What it needs: time to book, travel time for the interpreter and a little planning about seating and breaks. For rare languages, booking early is essential.
A quick comparison
| Question | Telephone (OPI) | Video (VRI) | Face-to-face |
|---|---|---|---|
| Visual cues and gestures | No | Yes, on screen | Yes, fully |
| Sign languages | Not possible | Yes | Yes |
| Speed of access | Fastest, often on demand | Usually pre-booked, can be quick | Needs booking ahead |
| Long or emotional conversations | Harder | Workable with good set-up | Best suited |
| Several speakers | Difficult | Workable with discipline | Best suited |
| Technology risk | Low (sound quality) | Higher (picture, sound, connection) | Lowest |
Examples from different settings
The scenarios below are illustrative, not real cases, but they show how the questions above play out.
- A GP practice confirming an appointment with a patient who speaks Tigrinya: low risk, short, routine. Telephone interpreting is the natural choice.
- A hospital consultant explaining a cancer diagnosis: high stakes and emotionally heavy. Face-to-face, or video if on site is impossible, with time for questions.
- A solicitor taking first instructions from a client in detention: visual contact matters for trust and for reading documents together. Video at least, on site where possible.
- A school meeting with a Deaf parent who uses British Sign Language: a sign language interpreter on site, or by video if necessary. Never the telephone.
- A council housing officer making an urgent call to a tenant late in the evening: telephone interpreting, with a follow-up meeting booked in the right format if the matter is complex.
Mistakes to avoid
- Using family members or children to interpret. Patients and service users should always be offered a professional interpreter. Relying on family or friends risks errors and silences sensitive information, and children should never be asked to interpret except in a genuine emergency.
- Choosing the quickest option by default. The real measure is whether the conversation achieves its purpose. A repeated appointment or a misunderstanding in evidence is far more disruptive than taking a little longer to book the right format.
- Forgetting the dialect. In every format, specify the language and, where you know it, the dialect or region. A Sudanese Arabic speaker and a Moroccan Arabic speaker may struggle to understand each other in detail.
- Not briefing the interpreter. Whatever the format, a short briefing on the purpose of the conversation and any specialist terms improves accuracy.
Telephone, video and face-to-face interpreting services from SILA Linguists®
SILA Linguists® provides all three formats compared in this guide, in 350+ languages and dialects. Telephone interpreting is available 24 hours a day, 365 days a year, from any phone or through the SILA Linguists® app. Video remote interpreting runs on secure, encrypted platforms or in our app. Face-to-face interpreters attend legal, medical, business and community appointments, and an interpreter of a preferred gender is available on request. For meetings and events we also provide conference interpreting and simultaneous interpreting, including remote simultaneous interpreting (RSI), and community and public service interpreting for everyday appointments.
Many conversations lead to paperwork. Our translation services cover letters, reports and contracts, with certified translation when a UK authority asks for it, and our transcription team turns recorded interviews and meetings into time-coded transcripts, translated if needed.
Our services are available across the UK, North America, Australia, New Zealand and beyond, in sectors such as healthcare, legal and the public sector. If you are unsure which format suits an appointment, describe the conversation to our bookings team and we will recommend one, or try the format selector on our interpreting page. Email bookings@silalinguists.co.uk or call +44 (0)333 339 8218.
