diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ea675b..8185a06 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,19 @@ bump may contain breaking changes, and each one is listed below.
 
 ## [Unreleased]
 
+### Fixed
+
+- A VoIP push that arrives before the host has called
+  `loginWithConfiguration:` no longer runs the full start path and fails with
+  `CallWaveErrorNotConfigured`. With no credentials there is nothing to
+  register, and the login that follows the push starts the stack itself, so the
+  registration nudge now logs one informational line instead of an error on
+  every call.
+- A push handled in host-owned CallKit mode nudges the registration once.
+  `-handleVoIPPushPayload:completion:` used to add a second nudge on top of the
+  one `-prepareIncomingCallWithUUID:caller:` already performs, sending two
+  `REGISTER`s per call.
+
 ## [0.7.1] - 2026-09-08
 
 ### Fixed
diff --git a/CallWaveKit/CallWaveClient.m b/CallWaveKit/CallWaveClient.m
index dfa103a..8f088f2 100644
--- a/CallWaveKit/CallWaveClient.m
+++ b/CallWaveKit/CallWaveClient.m
@@ -3309,6 +3309,16 @@ - (void)wakeRegistration {
         // serialized queue turn as start/stop. Otherwise stop() can destroy
         // PJSUA after the check but before registration is refreshed.
         if (![self validateAccountWithError:NULL]) {
+            if (self.configuration == nil) {
+                // Credentials-on-first-push hosts have not called
+                // -loginWithConfiguration: yet: the push is what makes them
+                // fetch the account. There is nothing to register here, and
+                // that login starts the stack on its own, so waking is a no-op
+                // rather than a failed start.
+                CWLogInfo(CallWaveLogCategoryPush,
+                          @"no SIP account yet; waiting for -loginWithConfiguration:");
+                return;
+            }
             NSError *error = nil;
             if (![self startWithError:&error] && error != nil) {
                 CWLogError(CallWaveLogCategoryPush, @"start after VoIP push failed: %@", error);
@@ -3440,7 +3450,12 @@ - (void)handleVoIPPushPayload:(NSDictionary *)payload
                 acknowledge(error == nil ? @"CallKit accepted the call" : @"CallKit refused the call");
             });
         }];
-        [self wakeRegistration];
+        if (self.managesCallKit) {
+            // In host-owned mode the report above went through
+            // -prepareIncomingCallWithUUID:caller:, which already woke the
+            // registration; a second nudge would REGISTER twice per push.
+            [self wakeRegistration];
+        }
     });
 }
 
diff --git a/CallWaveKit/README.md b/CallWaveKit/README.md
index 79f70f6..ad1e29d 100644
--- a/CallWaveKit/README.md
+++ b/CallWaveKit/README.md
@@ -204,6 +204,10 @@ from a VoIP push on every call — unlike a `stop()`/`start()` cycle, which mean
 `pjsua_destroy()`/`pjsua_create()` in the background. An identical configuration
 only refreshes the registration.
 
+A push that arrives before the first `login(configuration:)` finds no account
+to refresh. The library logs one informational line and waits for that login,
+which starts the stack itself.
+
 Between calls, release the account without tearing the stack down:
 
 ```swift
diff --git a/Tests/CallWaveKitRegistryTests/CallWavePushWakeRegistrationTests.m b/Tests/CallWaveKitRegistryTests/CallWavePushWakeRegistrationTests.m
new file mode 100644
index 0000000..a3ef100
--- /dev/null
+++ b/Tests/CallWaveKitRegistryTests/CallWavePushWakeRegistrationTests.m
@@ -0,0 +1,126 @@
+#import <XCTest/XCTest.h>
+
+#import "CallWaveClient.h"
+#import "CallWaveLogInternal.h"
+
+// A push for a host that only learns its credentials from that push used to
+// run the full -startWithError: path, which has no configuration to register
+// and therefore failed with CallWaveErrorNotConfigured on every single call.
+// The call itself survived — the host's -loginWithConfiguration: landed a
+// moment later — but every call logged an error for a state the library
+// documents as supported.
+
+@interface CallWaveClient (PushWakeTests)
+- (void)performSIPSync:(NS_NOESCAPE dispatch_block_t)block;
+- (void)wakeRegistration;
+@end
+
+@interface CallWavePushWakeProbe : NSObject <CallWaveLogger>
+@property (nonatomic, strong) NSMutableArray<NSString *> *messages;
+@end
+
+@implementation CallWavePushWakeProbe
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _messages = [NSMutableArray array];
+    }
+    return self;
+}
+
+- (void)callWaveDidLogMessage:(NSString *)message
+                        level:(CallWaveLogLevel)level
+                     category:(NSString *)category {
+    @synchronized (self) {
+        [self.messages addObject:message];
+    }
+}
+
+- (BOOL)sawMessageContaining:(NSString *)needle {
+    @synchronized (self) {
+        for (NSString *message in self.messages) {
+            if ([message containsString:needle]) {
+                return YES;
+            }
+        }
+    }
+    return NO;
+}
+
+@end
+
+// Counts the nudges a single push produces.
+@interface CallWaveWakeCountingClient : CallWaveClient
+@property (nonatomic, assign) NSUInteger wakeCount;
+@end
+
+@implementation CallWaveWakeCountingClient
+- (void)wakeRegistration {
+    self.wakeCount += 1;
+    [super wakeRegistration];
+}
+@end
+
+@interface CallWavePushWakeRegistrationTests : XCTestCase
+@property (nonatomic, strong) CallWavePushWakeProbe *probe;
+@property (nonatomic, assign) CallWaveLogLevel previousLevel;
+@end
+
+@implementation CallWavePushWakeRegistrationTests
+
+- (void)setUp {
+    [super setUp];
+    self.probe = [[CallWavePushWakeProbe alloc] init];
+    self.previousLevel = CallWaveLog.level;
+    CallWaveLog.level = CallWaveLogLevelInfo;
+    CallWaveLog.logger = self.probe;
+}
+
+- (void)tearDown {
+    CallWaveLog.logger = nil;
+    CallWaveLog.level = self.previousLevel;
+    self.probe = nil;
+    [super tearDown];
+}
+
+- (CallWaveEngineConfiguration *)engine {
+    CallWaveEngineConfiguration *engine = [CallWaveEngineConfiguration defaultConfiguration];
+    engine.handlesNetworkChanges = NO;
+    engine.logLevel = CallWaveLogLevelInfo;
+    return engine;
+}
+
+- (void)testPushBeforeLoginDoesNotReportMissingConfiguration {
+    CallWaveClient *client = [[CallWaveClient alloc] initWithConfiguration:nil
+                                                                  options:CallWaveIntegrationOptionNone
+                                                                 provider:nil
+                                                      engineConfiguration:[self engine]];
+
+    [client prepareIncomingCallWithUUID:[NSUUID UUID] caller:@"1001"];
+    // The wake is queued on the SIP queue before this returns, so a synchronous
+    // turn behind it is enough to observe whatever it logged.
+    [client performSIPSync:^{}];
+
+    XCTAssertFalse([self.probe sawMessageContaining:@"No configuration"]);
+    XCTAssertTrue([self.probe sawMessageContaining:@"no SIP account yet"]);
+    XCTAssertFalse(client.isRunning);
+}
+
+- (void)testHostOwnedPushNudgesRegistrationOnce {
+    CallWaveWakeCountingClient *client =
+        [[CallWaveWakeCountingClient alloc] initWithConfiguration:nil
+                                                          options:CallWaveIntegrationOptionNone
+                                                         provider:nil
+                                              engineConfiguration:[self engine]];
+
+    XCTestExpectation *handled = [self expectationWithDescription:@"push handled"];
+    [client handleVoIPPushPayload:@{@"uuid": [NSUUID UUID].UUIDString, @"caller_id": @"1001"}
+                       completion:nil];
+    dispatch_async(dispatch_get_main_queue(), ^{ [handled fulfill]; });
+    [self waitForExpectations:@[handled] timeout:2];
+
+    XCTAssertEqual(client.wakeCount, 1u);
+}
+
+@end