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I changed the callto: links to tel: links in the footer and nofollowed them and my domain authority dropped 2.  I'm assuming this is because we lost 2.8K "external links"  Advice on how to remove 404s for Phone#'s without affecting DA?  Will just using the tel: format stop Moz from crawling them as 404's?  It was adding links to the 404 list that look like this: www.ocp.org/missals/callto:########### I assumed it was because to the crawlers the links looked like relative links this is what our links look like now: <a <span="" class="html-tag">href</a><a <span="" class="html-tag">="</a>tel:###########" rel="nofollow" title="Call us">########### Old footer links: <a <span="" class="html-tag">href</a><a <span="" class="html-tag">="</a>callto:###########" title="Call us">###########