<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->
<!-- Created: Fri Mar 27 20:02:19 UTC 2026 -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="tls_PreviousPeerGroupTotalShareholderReturnAmount" xlink:href="tls-20260507.xsd#tls_PreviousPeerGroupTotalShareholderReturnAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="tls_PreviousPeerGroupTotalShareholderReturnAmount_lbl" xml:lang="en-US">Previous Peer Group Total Shareholder Return Amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="tls_PreviousPeerGroupTotalShareholderReturnAmount" xlink:to="tls_PreviousPeerGroupTotalShareholderReturnAmount_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="tls_PreviousPeerGroupTotalShareholderReturnAmount_lbl0" xml:lang="en-US">Previous peer group total shareholder return amount.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="tls_PreviousPeerGroupTotalShareholderReturnAmount" xlink:to="tls_PreviousPeerGroupTotalShareholderReturnAmount_lbl0"/>
    <loc xlink:type="locator" xlink:label="tls_MarkGriffinMember" xlink:href="tls-20260507.xsd#tls_MarkGriffinMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="tls_MarkGriffinMember_lbl" xml:lang="en-US">Mark Griffin [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="tls_MarkGriffinMember" xlink:to="tls_MarkGriffinMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="tls_MarkGriffinMember_lbl0" xml:lang="en-US">Mark Griffin</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="tls_MarkGriffinMember" xlink:to="tls_MarkGriffinMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="tls_OneTimeEquityAwardMember" xlink:href="tls-20260507.xsd#tls_OneTimeEquityAwardMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="tls_OneTimeEquityAwardMember_lbl" xml:lang="en-US">One-Time Equity Award [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="tls_OneTimeEquityAwardMember" xlink:to="tls_OneTimeEquityAwardMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="tls_OneTimeEquityAwardMember_lbl0" xml:lang="en-US">One-time equity award.</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="tls_OneTimeEquityAwardMember" xlink:to="tls_OneTimeEquityAwardMember_lbl0"/>
  </labelLink>
</linkbase>
