diff --git a/service/config/sample.yml b/service/config/sample.yml
index 05a33af39..e28e7d9e1 100644
--- a/service/config/sample.yml
+++ b/service/config/sample.yml
@@ -282,6 +282,9 @@ zkConfig:
   serverPublic: ABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyz
   serverSecret: ABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzAA==
 
+genericZkConfig:
+  serverSecret: ABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/0123456789+abcdefghijklmnopqrstuvwxyzAA==
+
 appConfig:
   application: example
   environment: example
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerConfiguration.java b/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerConfiguration.java
index 4ed1d3465..397ff61f7 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerConfiguration.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerConfiguration.java
@@ -28,6 +28,7 @@ import org.whispersystems.textsecuregcm.configuration.DynamoDbClientConfiguratio
 import org.whispersystems.textsecuregcm.configuration.DynamoDbTables;
 import org.whispersystems.textsecuregcm.configuration.FcmConfiguration;
 import org.whispersystems.textsecuregcm.configuration.GcpAttachmentsConfiguration;
+import org.whispersystems.textsecuregcm.configuration.GenericZkConfig;
 import org.whispersystems.textsecuregcm.configuration.HCaptchaConfiguration;
 import org.whispersystems.textsecuregcm.configuration.MaxDeviceConfiguration;
 import org.whispersystems.textsecuregcm.configuration.MessageCacheConfiguration;
@@ -224,6 +225,11 @@ public class WhisperServerConfiguration extends Configuration {
   @JsonProperty
   private ZkConfig zkConfig;
 
+  @Valid
+  @NotNull
+  @JsonProperty
+  private GenericZkConfig genericZkConfig;
+
   @Valid
   @NotNull
   @JsonProperty
@@ -413,6 +419,10 @@ public class WhisperServerConfiguration extends Configuration {
     return zkConfig;
   }
 
+  public GenericZkConfig getGenericZkConfig() {
+    return genericZkConfig;
+  }
+
   public RemoteConfigConfiguration getRemoteConfigConfiguration() {
     return remoteConfig;
   }
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerService.java b/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerService.java
index 0a9c1fb2e..2242a5d33 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerService.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerService.java
@@ -57,6 +57,7 @@ import org.signal.event.AdminEventLogger;
 import org.signal.event.GoogleCloudAdminEventLogger;
 import org.signal.i18n.HeaderControlledResourceBundleLookup;
 import org.signal.libsignal.zkgroup.ServerSecretParams;
+import org.signal.libsignal.zkgroup.GenericServerSecretParams;
 import org.signal.libsignal.zkgroup.auth.ServerZkAuthOperations;
 import org.signal.libsignal.zkgroup.profiles.ServerZkProfileOperations;
 import org.signal.libsignal.zkgroup.receipts.ReceiptCredentialPresentation;
@@ -620,6 +621,7 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
         config.getCdnConfiguration().getRegion());
 
     ServerSecretParams zkSecretParams = new ServerSecretParams(config.getZkConfig().getServerSecret());
+    GenericServerSecretParams genericZkSecretParams = new GenericServerSecretParams(config.getGenericZkConfig().serverSecret());
     ServerZkProfileOperations zkProfileOperations = new ServerZkProfileOperations(zkSecretParams);
     ServerZkAuthOperations zkAuthOperations = new ServerZkAuthOperations(zkSecretParams);
     ServerZkReceiptOperations zkReceiptOperations = new ServerZkReceiptOperations(zkSecretParams);
@@ -720,7 +722,7 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
         new AttachmentControllerV2(rateLimiters, config.getAwsAttachmentsConfiguration().getAccessKey(), config.getAwsAttachmentsConfiguration().getAccessSecret(), config.getAwsAttachmentsConfiguration().getRegion(), config.getAwsAttachmentsConfiguration().getBucket()),
         new AttachmentControllerV3(rateLimiters, config.getGcpAttachmentsConfiguration().getDomain(), config.getGcpAttachmentsConfiguration().getEmail(), config.getGcpAttachmentsConfiguration().getMaxSizeInBytes(), config.getGcpAttachmentsConfiguration().getPathPrefix(), config.getGcpAttachmentsConfiguration().getRsaSigningKey()),
         new CallLinkController(callLinkCredentialsGenerator),
-        new CertificateController(new CertificateGenerator(config.getDeliveryCertificate().getCertificate(), config.getDeliveryCertificate().getPrivateKey(), config.getDeliveryCertificate().getExpiresDays()), zkAuthOperations, clock),
+        new CertificateController(new CertificateGenerator(config.getDeliveryCertificate().getCertificate(), config.getDeliveryCertificate().getPrivateKey(), config.getDeliveryCertificate().getExpiresDays()), zkAuthOperations, genericZkSecretParams, clock),
         new ChallengeController(rateLimitChallengeManager),
         new DeviceController(pendingDevicesManager, accountsManager, messagesManager, keys, rateLimiters, config.getMaxDevices()),
         new DirectoryV2Controller(directoryV2CredentialsGenerator),
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/configuration/GenericZkConfig.java b/service/src/main/java/org/whispersystems/textsecuregcm/configuration/GenericZkConfig.java
new file mode 100644
index 000000000..295939e33
--- /dev/null
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/configuration/GenericZkConfig.java
@@ -0,0 +1,15 @@
+package org.whispersystems.textsecuregcm.configuration;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import org.whispersystems.textsecuregcm.util.ByteArrayAdapter;
+import javax.validation.constraints.NotNull;
+
+public record GenericZkConfig (
+  @JsonProperty
+  @JsonSerialize(using = ByteArrayAdapter.Serializing.class)
+  @JsonDeserialize(using = ByteArrayAdapter.Deserializing.class)
+  @NotNull
+  byte[] serverSecret
+) {}
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/controllers/CertificateController.java b/service/src/main/java/org/whispersystems/textsecuregcm/controllers/CertificateController.java
index f807391a5..f687974ab 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/controllers/CertificateController.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/controllers/CertificateController.java
@@ -32,6 +32,8 @@ import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import org.signal.libsignal.zkgroup.auth.ServerZkAuthOperations;
+import org.signal.libsignal.zkgroup.calllinks.CallLinkAuthCredentialResponse;
+import org.signal.libsignal.zkgroup.GenericServerSecretParams;
 import org.whispersystems.textsecuregcm.auth.AuthenticatedAccount;
 import org.whispersystems.textsecuregcm.auth.CertificateGenerator;
 import org.whispersystems.textsecuregcm.entities.DeliveryCertificate;
@@ -45,6 +47,7 @@ public class CertificateController {
 
   private final CertificateGenerator certificateGenerator;
   private final ServerZkAuthOperations serverZkAuthOperations;
+  private final GenericServerSecretParams genericServerSecretParams;
   private final Clock clock;
 
   @VisibleForTesting
@@ -55,9 +58,11 @@ public class CertificateController {
   public CertificateController(
       @Nonnull CertificateGenerator certificateGenerator,
       @Nonnull ServerZkAuthOperations serverZkAuthOperations,
+      @Nonnull GenericServerSecretParams genericServerSecretParams,
       @Nonnull Clock clock) {
     this.certificateGenerator = Objects.requireNonNull(certificateGenerator);
     this.serverZkAuthOperations = Objects.requireNonNull(serverZkAuthOperations);
+    this.genericServerSecretParams = genericServerSecretParams;
     this.clock = Objects.requireNonNull(clock);
   }
 
@@ -103,19 +108,26 @@ public class CertificateController {
     }
 
     final List<GroupCredentials.GroupCredential> credentials = new ArrayList<>();
+    final List<GroupCredentials.CallLinkAuthCredential> callLinkAuthCredentials = new ArrayList<>();
 
     Instant redemption = redemptionStart;
 
     UUID aci = auth.getAccount().getUuid();
     UUID pni = auth.getAccount().getPhoneNumberIdentifier();
+
     while (!redemption.isAfter(redemptionEnd)) {
       credentials.add(new GroupCredentials.GroupCredential(
           serverZkAuthOperations.issueAuthCredentialWithPni(aci, pni, redemption).serialize(),
           (int) redemption.getEpochSecond()));
 
+      callLinkAuthCredentials.add(new GroupCredentials.CallLinkAuthCredential(
+          CallLinkAuthCredentialResponse.issueCredential(aci, redemption, genericServerSecretParams).serialize(),
+          redemption.getEpochSecond()));
+
       redemption = redemption.plus(Duration.ofDays(1));
     }
 
-    return new GroupCredentials(credentials, pni);
+
+    return new GroupCredentials(credentials, callLinkAuthCredentials, pni);
   }
 }
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/entities/GroupCredentials.java b/service/src/main/java/org/whispersystems/textsecuregcm/entities/GroupCredentials.java
index 1348c18f6..e0e8c3ff4 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/entities/GroupCredentials.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/entities/GroupCredentials.java
@@ -9,8 +9,11 @@ import java.util.List;
 import java.util.UUID;
 import javax.annotation.Nullable;
 
-public record GroupCredentials(List<GroupCredential> credentials, @Nullable UUID pni) {
+public record GroupCredentials(List<GroupCredential> credentials, List<CallLinkAuthCredential> callLinkAuthCredentials, @Nullable UUID pni) {
 
   public record GroupCredential(byte[] credential, long redemptionTime) {
   }
+
+  public record CallLinkAuthCredential(byte[] credential, long redemptionTime) {
+  }
 }
diff --git a/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/CertificateControllerTest.java b/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/CertificateControllerTest.java
index d27cd71b8..b80edf19e 100644
--- a/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/CertificateControllerTest.java
+++ b/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/CertificateControllerTest.java
@@ -32,10 +32,12 @@ import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.signal.libsignal.protocol.InvalidKeyException;
 import org.signal.libsignal.protocol.ecc.Curve;
+import org.signal.libsignal.zkgroup.GenericServerSecretParams;
 import org.signal.libsignal.zkgroup.ServerSecretParams;
 import org.signal.libsignal.zkgroup.auth.AuthCredentialWithPniResponse;
 import org.signal.libsignal.zkgroup.auth.ClientZkAuthOperations;
 import org.signal.libsignal.zkgroup.auth.ServerZkAuthOperations;
+import org.signal.libsignal.zkgroup.calllinks.CallLinkAuthCredentialResponse;
 import org.whispersystems.textsecuregcm.auth.AuthenticatedAccount;
 import org.whispersystems.textsecuregcm.auth.CertificateGenerator;
 import org.whispersystems.textsecuregcm.auth.DisabledPermittedAuthenticatedAccount;
@@ -60,6 +62,8 @@ class CertificateControllerTest {
   private static final String signingKey = "ABOxG29xrfq4E7IrW11Eg7+HBbtba9iiS0500YoBjn4=";
 
   private static final ServerSecretParams serverSecretParams = ServerSecretParams.generate();
+
+  private static final GenericServerSecretParams genericServerSecretParams = GenericServerSecretParams.generate();
   private static final CertificateGenerator certificateGenerator;
   private static final ServerZkAuthOperations serverZkAuthOperations;
   private static final Clock clock = Clock.fixed(Instant.now(), ZoneId.systemDefault());
@@ -81,7 +85,7 @@ class CertificateControllerTest {
           ImmutableSet.of(AuthenticatedAccount.class, DisabledPermittedAuthenticatedAccount.class)))
       .setMapper(SystemMapper.jsonMapper())
       .setTestContainerFactory(new GrizzlyWebTestContainerFactory())
-      .addResource(new CertificateController(certificateGenerator, serverZkAuthOperations, clock))
+      .addResource(new CertificateController(certificateGenerator, serverZkAuthOperations, genericServerSecretParams, clock))
       .build();
 
   @Test
@@ -230,8 +234,11 @@ class CertificateControllerTest {
         .get(GroupCredentials.class);
 
     assertEquals(1, credentials.credentials().size());
+    assertEquals(1, credentials.callLinkAuthCredentials().size());
+
     assertEquals(AuthHelper.VALID_PNI, credentials.pni());
     assertEquals(startOfDay.getEpochSecond(), credentials.credentials().get(0).redemptionTime());
+    assertEquals(startOfDay.getEpochSecond(), credentials.callLinkAuthCredentials().get(0).redemptionTime());
 
     final ClientZkAuthOperations clientZkAuthOperations =
         new ClientZkAuthOperations(serverSecretParams.getPublicParams());
@@ -243,6 +250,11 @@ class CertificateControllerTest {
           (int) startOfDay.getEpochSecond(),
           new AuthCredentialWithPniResponse(credentials.credentials().get(0).credential()));
     });
+
+    assertDoesNotThrow(() -> {
+      new CallLinkAuthCredentialResponse(credentials.callLinkAuthCredentials().get(0).credential())
+          .receive(AuthHelper.VALID_UUID, startOfDay, genericServerSecretParams.getPublicParams());
+    });
   }
 
   @Test
@@ -259,6 +271,7 @@ class CertificateControllerTest {
 
     assertEquals(AuthHelper.VALID_PNI, credentials.pni());
     assertEquals(8, credentials.credentials().size());
+    assertEquals(8, credentials.callLinkAuthCredentials().size());
 
     final ClientZkAuthOperations clientZkAuthOperations =
         new ClientZkAuthOperations(serverSecretParams.getPublicParams());
@@ -266,6 +279,7 @@ class CertificateControllerTest {
     for (int i = 0; i < 8; i++) {
       final Instant redemptionTime = startOfDay.plus(Duration.ofDays(i));
       assertEquals(redemptionTime.getEpochSecond(), credentials.credentials().get(i).redemptionTime());
+      assertEquals(redemptionTime.getEpochSecond(), credentials.callLinkAuthCredentials().get(i).redemptionTime());
 
       final int index = i;
 
@@ -276,6 +290,11 @@ class CertificateControllerTest {
             redemptionTime.getEpochSecond(),
             new AuthCredentialWithPniResponse(credentials.credentials().get(index).credential()));
       });
+
+      assertDoesNotThrow(() -> {
+        new CallLinkAuthCredentialResponse(credentials.callLinkAuthCredentials().get(index).credential())
+            .receive(AuthHelper.VALID_UUID, redemptionTime, genericServerSecretParams.getPublicParams());
+      });
     }
   }