Short duration calls<\/strong>: Very brief calls (under 20 seconds) are often interpreted as suspicious. They’re characteristic of auto-dialers or scams that hang up quickly.<\/li><\/ol>\n\n\n\nTip<\/strong>: Leave a voicemail if the call isn’t answered. This increases your average call duration and signals legitimacy.<\/p>\n\n\n\n- High volume from a single caller ID<\/strong>: Pushing thousands of calls per day from a single caller ID (CLI or CLID) can trigger anti-fraud algorithms.<\/li><\/ol>\n\n\n\n
Tip<\/strong>: Limit outbound attempts to 1,000 calls per number per day. This threshold is widely recommended, but remember, networks may apply their own limits.<\/p>\n\n\n\n- Invalid or uncallable caller IDs<\/strong>
If your number can\u2019t be called back (eg. if it’s a disconnected or masked number), it’s more likely to be blocked.<\/li><\/ol>\n\n\n\nTip<\/strong>: Always use a valid, callable CLI that allows respondents to return your call, even if it connects to your own or a hosted voicemail system.<\/p>\n\n\n\nNetwork-level protections that impact campaigns<\/h2>\n\n\n\n
\ud83d\udeab Carrier Blocking and Scam Filters<\/strong>
Australian carriers like Telstra have deployed services like Scam Protect, which apply advanced heuristics and machine learning to identify suspicious traffic. This means even legitimate CATI campaigns can be blacklisted if they resemble known scam patterns. Do you know if your CLIs are being flagged?<\/p>\n\n\n\n\ud83d\uded1 Anti-Flood Protection<\/strong>
Some carriers implement traffic shaping or outright blocking when they detect high call concurrency or spikes in call rates. The solution? Distribute your calls across more CLIs.<\/p>\n\n\n\nThe infrastructure supporting your calls<\/h2>\n\n\n\n
Your SIP trunk is more than just a connection… it\u2019s your lifeline to the public telephone network. If it\u2019s under-provisioned or there isn’t enough capacity, your campaigns can experience dropped calls or degraded quality. Some providers limit SIP trunk capacity by channels (number of outgoing simultaneous calls) or CPS (calls per second). If you’re unaware of these limits, you might be bottlenecking your campaign.<\/p>\n\n\n\n
\ud83d\udce3 Enfonica\u2019s SIP trunks are uncapped by default<\/strong>. No channel limits, no hidden costs. That means greater reliability with fewer disruptions.<\/p>\n\n\n\nThe hidden cost of being blacklisted<\/h2>\n\n\n\n
In Australia, over 25% of phones automatically block unknown or suspected scam calls. If you\u2019ve been flagged:<\/p>\n\n\n\n
- Your calls might never connect.<\/li>
- Your caller ID could display a “Spam” or “Fraud” warning.<\/li><\/ul>\n\n\n\n
Once blacklisted, getting delisted is difficult, and it’s likely to happen again. That\u2019s why proactive CLI management and responsible calling behavior are essential for long-term success.<\/p>\n\n\n\n
Key takeaways for market researchers<\/h2>\n\n\n\n
To maintain high response rates and preserve the integrity of your studies, consider these best practices:<\/p>\n\n\n\n
\u2705 Keep call durations above 20 seconds. Leave voicemails!<\/p>\n\n\n\n
\u2705 Limit call attempts to 1,000 per number per day.<\/p>\n\n\n\n
\u2705 Always use return-callable, valid CLIs.<\/p>\n\n\n\n
\u2705 Monitor SIP trunk capacity and ensure no hidden channel\/CPS caps.<\/p>\n\n\n\n
\u2705 Diversify your caller IDs and stagger your calls to avoid traffic spikes.<\/p>\n\n\n\n
Enfonica can help<\/h2>\n\n\n\n
Need help reviewing your call strategy or upgrading your SIP infrastructure? Contact us to find out how Enfonica\u2019s can support your market research operations.<\/p>\n","protected":false},"excerpt":{"rendered":"
Market research organizations that conduct large volumes of telephone surveys using Computer-Assisted Telephone Interviewing (CATI) platforms face a growing challenge: making sure their outbound calls reach respondents. As mobile networks…<\/p>\n","protected":false},"author":4,"featured_media":588,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[22,49,5,48],"tags":[],"yoast_head":"\n
Optimizing Outbound CATI Calling<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Optimizing Outbound CATI Calling\" \/>\n<meta property=\"og:description\" content=\"Market research organizations that conduct large volumes of telephone surveys using Computer-Assisted Telephone Interviewing (CATI) platforms face a growing challenge: making sure their outbound calls reach respondents. As mobile networks...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/\" \/>\n<meta property=\"og:site_name\" content=\"Enfonica\" \/>\n<meta property=\"article:published_time\" content=\"2025-05-21T23:59:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-21T23:59:07+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/enfonica.com\/blog\/wp-content\/uploads\/2025\/05\/Blog-Images-55.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1250\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"http:\/\/127.0.0.1\/blog\/#website\",\"url\":\"http:\/\/127.0.0.1\/blog\/\",\"name\":\"Enfonica\",\"description\":\"Our mission is to revolutionize communications technology.\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"http:\/\/127.0.0.1\/blog\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/enfonica.com\/blog\/wp-content\/uploads\/2025\/05\/Blog-Images-55.png\",\"contentUrl\":\"https:\/\/enfonica.com\/blog\/wp-content\/uploads\/2025\/05\/Blog-Images-55.png\",\"width\":1250,\"height\":630},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/#webpage\",\"url\":\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/\",\"name\":\"Optimizing Outbound CATI Calling\",\"isPartOf\":{\"@id\":\"http:\/\/127.0.0.1\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/#primaryimage\"},\"datePublished\":\"2025-05-21T23:59:06+00:00\",\"dateModified\":\"2025-05-21T23:59:07+00:00\",\"author\":{\"@id\":\"http:\/\/127.0.0.1\/blog\/#\/schema\/person\/81fc4ed88837f7120305eface9efbefe\"},\"breadcrumb\":{\"@id\":\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/enfonica.com\/blog\/optimizing-outbound-cati-calling\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"http:\/\/127.0.0.1\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Optimizing Outbound CATI Calling\"}]},{\"@type\":\"Person\",\"@id\":\"http:\/\/127.0.0.1\/blog\/#\/schema\/person\/81fc4ed88837f7120305eface9efbefe\",\"name\":\"Braydon Gould\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"http:\/\/127.0.0.1\/blog\/#personlogo\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/eed35526c1eb9c956358fcc8274846af?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/eed35526c1eb9c956358fcc8274846af?s=96&d=mm&r=g\",\"caption\":\"Braydon Gould\"},\"url\":\"https:\/\/enfonica.com\/blog\/author\/braydon-gould\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/posts\/587"}],"collection":[{"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/comments?post=587"}],"version-history":[{"count":2,"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/posts\/587\/revisions"}],"predecessor-version":[{"id":590,"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/posts\/587\/revisions\/590"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/media\/588"}],"wp:attachment":[{"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/media?parent=587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/categories?post=587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enfonica.com\/blog\/wp-json\/wp\/v2\/tags?post=587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}