Multi-channel sequence design is the difference between AI outbound that converts and AI outbound that gets ignored. The right channel mix, touch count, and timing produces 2-5x higher engagement than email-only sequences. Artra automates the coordination across email + LinkedIn + SMS + dialer.
Sample multi-channel sequence (14-day cadence)
| Day | Channel | Touch |
|---|---|---|
| 1 | Personalized opener referencing signal | |
| 3 | Connection request mentioning the same signal | |
| 5 | Follow-up with different angle (e.g., case study) | |
| 7 | DM if connection accepted | |
| 10 | Call | Local-presence call; voicemail drop on no-answer |
| 14 | Final touch with clear ask ("worth a 15-min call?") |
Channel mix by ICP
| ICP | Channel mix |
|---|---|
| Senior enterprise buyers (CISO, CFO, VP+) | Email 80%, LinkedIn 20%, no SMS |
| Mid-market managers | Email 60%, LinkedIn 25%, voicemail 10%, SMS 5% |
| SMB owners | Email 50%, SMS 25%, calls 25% |
| Real estate / contractors | Calls + SMS 60%, email 40% |
| Technical buyers (engineers) | Email 70%, LinkedIn 30%, no SMS/calls |
| Candidates (recruiting) | LinkedIn 50%, email 30%, SMS 20% |
Cadence design principles
- Lead with email — most prospects check email first.
- Add LinkedIn after touch 2-3 with connection request.
- Escalate to voicemail/SMS only after engagement signals.
- Reference prior touches in subsequent ones.
- Stop all touches when prospect engages or unsubscribes.
- Don't try to use every channel — pick what fits the ICP.
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Frequently asked questions
How should multi-channel AI SDR sequences be designed?
Multi-channel AI SDR sequences should: (1) lead with email (most prospects check email first), (2) introduce LinkedIn touches around touch 2-3 after acceptance, (3) add SMS sparingly at high-engagement points (after open + email reply pattern), (4) use voicemail drops for late-cadence re-engagement, (5) coordinate timing so prospects don't get overwhelmed (spacing 2-4 days between touches), (6) avoid contradictory messaging across channels. Artra automates this coordination.
How many touches should a multi-channel sequence include?
Typical multi-channel sequence touch counts: short cadence 4-6 touches over 14 days (high-volume outbound), medium 6-10 touches over 30-45 days (standard B2B), long cadence 8-15 touches over 60-120 days (enterprise / senior buyers / long sales cycles). More touches = more chances to engage but diminishing returns after 12-15 touches per prospect.
What's the right channel mix for B2B outbound?
Right channel mix for B2B outbound in 2026: email 60-70% of touches (primary channel), LinkedIn 20-30% (connection + DMs after acceptance), voicemail drops 5-10% (high-engagement points), SMS 0-10% (specific ICPs only — real estate, contractors, candidates). Don't try to use every channel — overusing SMS or calls with wrong audiences damages reputation.
How do you coordinate touches across channels?
Coordinate multi-channel touches by: (1) configuring sequence templates with channel + timing per touch, (2) waiting for engagement signals before escalating channels (don't SMS someone who didn't open the first email), (3) referencing prior touches in subsequent ones ('I sent a note earlier this week'), (4) stopping all touches when a prospect engages or unsubscribes, (5) using AI SDR's reply qualification to route engaged prospects to the rep immediately. Artra handles this automatically.
What's the optimal time spacing between touches?
Optimal touch spacing in multi-channel sequences: 2-4 days between touches in the first 2 weeks (sequencing), 4-7 days between touches in weeks 3-6 (slower nurture), 7-14 days between touches in months 2-4 (long-tail engagement). Shorter spacing risks annoyance; longer spacing risks forgetting. AI SDRs like Artra adjust spacing dynamically based on prospect engagement signals.