Do you mean for a consumer/home set‑up, a small/medium business, or an enterprise (multi‑site with SLA, SIP trunks, SD‑WAN, contact center)? I’ll give a concise, practical breakdown for each use case and the leading options in Canada so you can pick what fits best.

Summary — the top vendors and solutions to consider in Canada

• Mobile (consumer & business): Bell, Rogers, Telus (and their flanker brands such as Koodo, Fido, Virgin). These three dominate mobile market share and generally offer the widest coverage and business plans. (crtc.gc.ca)
• Fixed broadband / business internet: Bell (Fibe/fibre), Telus (fibre), Rogers/Shaw/Cogeco (cable/fibre where available). Regional ISPs (Videotron, Eastlink, SaskTel, etc.) also compete strongly in their provinces. For measured performance data, independent tests (e.g., Opensignal) show Bell, Rogers and Telus leading in various metrics. (opensignal.com)
• Cloud voice / UCaaS (small → large businesses): RingCentral, 8x8, Zoom Phone, Microsoft Teams Calling (via partners), Cisco Webex Calling, Dialpad — plus Canadian vendors like Sangoma / Allstream for local/regulatory reasons. These provide hosted PBX, contact center, SMS, and PSTN connectivity. (RingCentral.com)
• Enterprise networking / data (multi‑site): MPLS / DIA from Bell/Telus/Rogers or fibre lit services; SD‑WAN & managed WAN from Cisco (Viptela), VMware (VeloCloud), Fortinet, Versa, and specialist providers/partners (and global SD‑WAN services such as Aryaka). For large Canadian customers, Telus and Bell are investing heavily in expanding fibre and data centers. (reuters.com)

By use case — recommended options and why

1. Consumer / Home (voice + data)

• Best overall coverage: Bell, Rogers, Telus — choose based on which has best signal in your neighborhood. Independent regional tests show differences by province; Rogers often leads regionally for download/consistent quality while Bell scores high on upload. (opensignal.com)
• Lower cost / prepaid / MVNOs: Fizz, Public Mobile, Lucky Mobile, Virgin, Koodo — cheap plans using the big‑three networks (good if coverage is acceptable).
• Home internet: choose fibre if available (Bell Fibe, Telus PureFibre). Where fibre isn’t available, cable (Rogers, Shaw, Cogeco) is usually the next best option. (opensignal.com)

2. Small & Medium Business (SMB) — up to ~250 users

• Cloud PBX / UCaaS: RingCentral or 8x8 are strong choices for turnkey cloud voice + meetings + contact center. Microsoft Teams Calling if you already use Microsoft 365 (often via a partner for PSTN). Local Canadian players (Sangoma / Allstream) can be preferable when you want local billing, support or data residency considerations. (RingCentral.com)
• Internet: choose a business class fibre/DIA or business cable plan with an SLA from Bell/Telus/Rogers or local business ISPs. Add a redundant link (different provider or LTE/5G backup) for higher availability.
• SIP trunking / porting: most UCaaS providers and telcos support SIP trunks; ask about E911, CNAM, and number porting times in Canada.

3. Enterprise / Multi‑site / Regulated industries

• Network: direct fibre/DIA and managed SD‑WAN from Telus or Bell for nationwide coverage and SLAs; consider a global SD‑WAN/CDN partner (Cisco/VMware/Fortinet/Versa/Aryaka) depending on international needs. Telus and Bell are also expanding data centers and fibre investments—useful for hybrid cloud and DR. (reuters.com)
• Voice/contact center: deploy UCaaS + CCaaS from RingCentral, Cisco, Genesys, or 8x8, or a hybrid solution with local carriers for regulatory controls. Evaluate PCI/PHI compliance and local data residency if required. (RingCentral.com)

Selection criteria — what to compare

• Coverage & performance: test mobile signal and fixed broadband at your actual locations (use speed tests and carrier coverage maps). Independent reports (Opensignal, CRTC data) can help but verify locally. (opensignal.com)
• SLAs & support: uptime, mean time to repair, escalation path, 24/7 support.
• Features: UC features (voicemail→email, SMS, call recording, contact center, integrations), emergency calling (E911), compliance and call recording rules in Canada.
• Cost model: per‑user vs. metered; international calling rates; SIP trunk vs. full UCaaS.
• Redundancy & security: SD‑WAN, WAN encryption, DDoS protection, and 5G/LTE backup options.
• Regulatory/Privacy: If you need Canadian data residency or specific security certifications, prefer vendors offering Canadian sovereign hosting or local POPs.

Quick vendor cheat‑sheet

• Bell Canada — strong nationwide fibre & business services; often best for eastern/central Canada fibre and upload performance. Good enterprise SLAs. (opensignal.com)
• Telus — big fibre investments and major enterprise focus (including AI/data centers). Strong in Western Canada and national business offerings. (reuters.com)
• Rogers (incl. Shaw) — leading in many regional broadband metrics and large mobile subscriber base; strong cable footprint in many provinces. (opensignal.com)
• RingCentral / 8x8 / Zoom Phone / Microsoft Teams / Cisco Webex / Dialpad — primary UCaaS/CCaaS choices covering small → large businesses; compare feature sets, regulatory support, and integration into your stack. (RingCentral.com)
• Sangoma / Allstream (Canadian vendors) — useful where local presence, Canadian billing/support, or regulatory/local integration matters. (en.wikipedia.org)

Practical next steps (fast)

1. Identify your use case (consumer, SMB, enterprise) and key requirements: locations, user count, required uptime, compliance.
2. Run local tests: mobile coverage check + fixed broadband speed tests at each site.
3. Shortlist 2–3 providers per service (e.g., Bell & Telus for fibre; RingCentral & 8x8 for UC) and request quotes & SLA terms.
4. Ask for a pilot or proof of concept (30–90 days) — for voice, test call quality; for SD‑WAN, test failover and application performance.
5. Check contract terms: porting timelines, early termination, and support response commitments.

If you want, I can:

• Recommend a 2–3 vendor shortlist tailored to your exact locations and number of users (I’ll need postal codes and user counts), or
• Produce a comparison matrix (cost estimate, SLA, key features) for a given scenario (home, SMB, or enterprise).

Sources cited above: CRTC market and competition reports, Opensignal fixed broadband report, Reuters and company pages on Telus and RingCentral, vendor pages for RingCentral and 8x8, and Sangoma information. (crtc.gc.ca)

Which scenario should I build a short vendor shortlist for (home, SMB, or enterprise)?