diff --git a/backend/src/routes/telephony.ts b/backend/src/routes/telephony.ts
index ca907ec..ad91ba3 100644
--- a/backend/src/routes/telephony.ts
+++ b/backend/src/routes/telephony.ts
@@ -70,12 +70,14 @@ const trunkProviders = {
         label: "Telekom",
         defaultRegistrar: "tel.t-online.de",
         aorContactIncludesUser: false,
+        contactUserUsesCallerId: false,
     },
     easybell: {
         key: "easybell",
         label: "Easybell",
         defaultRegistrar: "voip.easybell.de",
         aorContactIncludesUser: true,
+        contactUserUsesCallerId: true,
     },
 } as const
 
@@ -187,8 +189,9 @@ const renderProviderPjsipConfig = (trunk: any) => {
     const password = asteriskValue(trunk.password)
     const callerId = asteriskValue(trunk.callerId) || sipUser
     const externalMediaAddress = asteriskValue(trunk.externalMediaAddress || trunk.externalSignalingAddress)
-    const aorContact = provider.aorContactIncludesUser && sipUser
-        ? `sip:${sipUser}@${registrar}`
+    const contactUser = provider.contactUserUsesCallerId && callerId ? callerId : sipUser
+    const aorContact = provider.aorContactIncludesUser && contactUser
+        ? `sip:${contactUser}@${registrar}`
         : `sip:${registrar}`
 
     return [
@@ -208,7 +211,7 @@ const renderProviderPjsipConfig = (trunk: any) => {
         "transport=transport-udp",
         `context=from-${providerKey}`,
         "disallow=all",
-        "allow=alaw,ulaw",
+        providerKey === "easybell" ? "allow=alaw,ulaw,g722" : "allow=alaw,ulaw",
         `aors=${providerKey}-aor`,
         `outbound_auth=${providerKey}-auth`,
         `from_user=${sipUser}`,
@@ -219,6 +222,10 @@ const renderProviderPjsipConfig = (trunk: any) => {
         "force_rport=yes",
         "rewrite_contact=yes",
         "rtp_symmetric=yes",
+        ...(providerKey === "easybell" ? [
+            "ice_support=no",
+            "send_pai=yes",
+        ] : []),
         "timers=no",
         "",
         `[${providerKey}-identify]`,
@@ -232,10 +239,10 @@ const renderProviderPjsipConfig = (trunk: any) => {
         `outbound_auth=${providerKey}-auth`,
         `server_uri=sip:${registrar}`,
         `client_uri=sip:${sipUser}@${registrar}`,
-        `contact_user=${sipUser}`,
+        `contact_user=${contactUser}`,
         "retry_interval=60",
-        "forbidden_retry_interval=300",
-        "expiration=480",
+        `forbidden_retry_interval=${providerKey === "easybell" ? "600" : "300"}`,
+        `expiration=${providerKey === "easybell" ? "1800" : "480"}`,
         "line=yes",
         `endpoint=${providerKey}`,
         "",
@@ -266,12 +273,12 @@ const renderProviderExtensionsConfig = (trunk: any) => {
             ? `exten => _${escapedPrefix}X.,1,NoOp(FEDEO ausgehend über ${provider.label}: $` + "{EXTEN})"
             : `exten => _X.,1,NoOp(FEDEO ausgehend über ${provider.label}: $` + "{EXTEN})",
         ` same => n,Set(CALLERID(num)=${callerId})`,
-        ` same => n,Dial(PJSIP/$` + `{EXTEN}@${providerKey},60)`,
+        ` same => n,Dial(PJSIP/${providerKey === "easybell" ? "sip:" : ""}$` + `{EXTEN}@${providerKey},60)`,
         " same => n,Hangup()",
         "",
         `exten => _+X.,1,NoOp(FEDEO ausgehend über ${provider.label}: $` + "{EXTEN})",
         ` same => n,Set(CALLERID(num)=${callerId})`,
-        ` same => n,Dial(PJSIP/$` + `{EXTEN}@${providerKey},60)`,
+        ` same => n,Dial(PJSIP/${providerKey === "easybell" ? "sip:" : ""}$` + `{EXTEN}@${providerKey},60)`,
         " same => n,Hangup()",
         "",
         `[from-${providerKey}]`,
diff --git a/frontend/pages/settings/tenant.vue b/frontend/pages/settings/tenant.vue
index 2168eb7..0af6973 100644
--- a/frontend/pages/settings/tenant.vue
+++ b/frontend/pages/settings/tenant.vue
@@ -143,7 +143,7 @@ const telephonyProviderDefaults = {
   easybell: {
     registrar: "voip.easybell.de",
     title: "Easybell SIP-Trunk",
-    description: "Nutze SIP-Benutzername und SIP-Passwort aus dem Easybell-Kundenportal. Der Registrar ist für SIP-Trunks in der Regel voip.easybell.de."
+    description: "Nutze SIP-Benutzername und SIP-Passwort aus dem Easybell-Kundenportal. Falls dort eine Kennung wie K... angezeigt wird, trage sie als Auth-User ein. Die Absendernummer ist die Stammnummer im internationalen Format ohne führende 00."
   },
   telekom: {
     registrar: "tel.t-online.de",