Migrating Genesys Cloud Web Messaging Sessions to Voice via Python SDK

What You Will Build

• You will build a production-grade Python module that migrates an active Genesys Cloud web messaging session to a voice call using the Media Migration API.
• You will use the official Genesys Cloud Python SDK (genesyscloud) to execute atomic POST operations against /api/v2/conversations/messaging/mediamigration.
• You will implement validation pipelines, SIP URI calculation, retry logic, webhook synchronization, latency tracking, and audit logging in Python 3.9+.

Prerequisites

• OAuth client credentials flow with scopes: messaging:conversation:write, telephony:phone:read, telephony:call:write, analytics:report:read
• Genesys Cloud Python SDK version 2.10.0 or higher
• Python 3.9+ runtime
• External dependencies: pip install genesyscloud httpx phonenumbers pydantic

Authentication Setup

Genesys Cloud requires OAuth 2.0 client credentials authentication. The SDK handles token acquisition and automatic refresh when configured correctly. You must initialize the platform client with your environment URL, client ID, and client secret.

import os
from genesyscloud import PureCloudPlatformClientV2

def init_genesys_client() -> PureCloudPlatformClientV2:
    """Initialize the Genesys Cloud platform client with OAuth credentials."""
    client = PureCloudPlatformClientV2(
        environment=os.getenv("GENESYS_ENVIRONMENT", "https://api.mypurecloud.com"),
        client_id=os.getenv("GENESYS_CLIENT_ID"),
        client_secret=os.getenv("GENESYS_CLIENT_SECRET")
    )
    # The SDK automatically caches and refreshes access tokens
    return client

The client object caches the access token in memory. When the token expires, subsequent SDK calls automatically trigger a refresh token flow. You do not need to implement manual token rotation unless you are caching tokens across process boundaries.

Implementation

Step 1: Validation Pipeline and Constraint Checking

Genesys Cloud enforces a strict maximum media switch limit of one migration per conversation. Attempting a second migration returns a 409 Conflict. You must validate the conversation state, verify customer consent, and confirm phone number formatting before sending the migration request.

import phonenumbers
from phonenumbers import NumberParseException
from pydantic import BaseModel, validator
from typing import Optional

class MigrationPayload(BaseModel):
    conversation_id: str
    target_phone_number: str
    callback_url: str
    customer_consent_id: Optional[str] = None

    @validator("target_phone_number")
    def validate_e164(cls, v: str) -> str:
        try:
            parsed = phonenumbers.parse(v, None)
            if not phonenumbers.is_valid_number(parsed):
                raise ValueError("Invalid phone number format")
            return phonenumbers.format_number(parsed, phonenumbers.PhoneNumberFormat.E164)
        except NumberParseException as e:
            raise ValueError(f"Phone number parsing failed: {e}")

def check_media_switch_limit(client: PureCloudPlatformClientV2, conversation_id: str) -> bool:
    """Verify that the conversation has not already been migrated."""
    from genesyscloud import MessagingApi
    messaging_api = MessagingApi(client)
    try:
        conv = messaging_api.get_conversations_messaging_conversation(conversation_id)
        # Genesys Cloud tracks migration state in the conversation object
        if hasattr(conv, 'media_migration_status') and conv.media_migration_status in ["migrated", "initiated"]:
            return False
        return True
    except Exception as e:
        raise RuntimeError(f"Conversation state check failed: {e}")

The check_media_switch_limit function queries the conversation resource to inspect the media_migration_status field. This prevents redundant POST requests that would trigger 409 responses. The MigrationPayload model uses Pydantic to enforce E.164 formatting at initialization, which eliminates malformed number errors during the API call.

Step 2: Payload Construction and SIP URI Calculation

Genesys Cloud voice routing requires a properly formatted SIP URI or E.164 phone number. When migrating to voice, the platform constructs an internal SIP URI for media capability negotiation. You must calculate the SIP URI format for audit logging and external orchestration alignment.

import httpx
import logging

logger = logging.getLogger(__name__)

def calculate_sip_uri(e164_number: str) -> str:
    """Convert E.164 number to Genesys Cloud SIP URI format."""
    # Strip leading '+' for SIP URI construction
    clean_number = e164_number.lstrip("+")
    return f"sip:{clean_number}@sip.genesyscloud.com"

def verify_customer_consent(consent_id: str, external_endpoint: str) -> bool:
    """Call external consent verification pipeline."""
    if not consent_id:
        logger.warning("No consent ID provided, bypassing external verification")
        return True
    
    try:
        with httpx.Client(timeout=5.0) as client:
            response = client.get(f"{external_endpoint}/consent/{consent_id}")
            response.raise_for_status()
            data = response.json()
            return data.get("is_active", False) and data.get("channels", {}).get("voice", False)
    except httpx.HTTPError as e:
        logger.error(f"Consent verification failed: {e}")
        return False

The calculate_sip_uri function generates the SIP address used by Genesys Cloud for media capability negotiation. The verify_customer_consent function calls an external orchestration engine to confirm that the customer has authorized voice interactions. This step ensures multi-channel continuity and prevents compliance violations during scaling events.

Step 3: Atomic POST Execution with Retry Logic

The media migration endpoint is an atomic POST operation. Genesys Cloud returns a 429 Too Many Requests during high-traffic scaling periods. You must implement exponential backoff to prevent cascading failures.

import time
from genesyscloud import MessagingApi, MediaMigrationRequest

def execute_migration_with_retry(
    client: PureCloudPlatformClientV2,
    payload: MigrationPayload,
    max_retries: int = 3,
    base_delay: float = 1.0
) -> dict:
    """Execute the media migration POST with 429 retry logic."""
    messaging_api = MessagingApi(client)
    sip_uri = calculate_sip_uri(payload.target_phone_number)
    
    request_body = MediaMigrationRequest(
        conversation_id=payload.conversation_id,
        media_migration_type="voice",
        target_phone_number=payload.target_phone_number,
        callback_url=payload.callback_url
    )
    
    for attempt in range(max_retries):
        try:
            start_time = time.time()
            response = messaging_api.post_conversations_messaging_mediamigration(request_body)
            latency_ms = (time.time() - start_time) * 1000
            
            audit_entry = {
                "conversation_id": payload.conversation_id,
                "sip_uri": sip_uri,
                "migration_id": response.migration_id if hasattr(response, "migration_id") else "unknown",
                "voice_conversation_id": response.voice_conversation_id if hasattr(response, "voice_conversation_id") else None,
                "status": "success",
                "latency_ms": round(latency_ms, 2),
                "attempt": attempt + 1
            }
            logger.info(f"Migration successful: {audit_entry}")
            return audit_entry
            
        except Exception as e:
            error_msg = str(e)
            # Handle 429 rate limiting with exponential backoff
            if "429" in error_msg or "rate limit" in error_msg.lower():
                delay = base_delay * (2 ** attempt)
                logger.warning(f"Rate limited on attempt {attempt + 1}. Retrying in {delay}s")
                time.sleep(delay)
                continue
            # Handle 400/403/409/5xx immediately
            elif any(code in error_msg for code in ["400", "403", "409"]):
                raise RuntimeError(f"Client error during migration: {error_msg}")
            else:
                raise RuntimeError(f"Server error during migration: {error_msg}")
    
    raise RuntimeError("Max retries exceeded for media migration")

The post_conversations_messaging_mediamigration method sends the atomic request to /api/v2/conversations/messaging/mediamigration. The retry loop catches 429 responses and applies exponential backoff. Client errors (400, 403, 409) fail immediately because they indicate configuration or state violations that retrying will not resolve. The latency calculation captures bridge initiation time for efficiency tracking.

Step 4: Webhook Synchronization and Metrics Tracking

Genesys Cloud emits a conversation.media.migrated webhook when the voice bridge completes. You must parse this payload to synchronize with external omnichannel orchestration engines and update success rate metrics.

from datetime import datetime

class MigrationMetrics:
    def __init__(self):
        self.total_attempts = 0
        self.successful_migrations = 0
        self.total_latency_ms = 0.0

    def record_attempt(self, latency_ms: float, success: bool):
        self.total_attempts += 1
        if success:
            self.successful_migrations += 1
            self.total_latency_ms += latency_ms

    def get_success_rate(self) -> float:
        if self.total_attempts == 0:
            return 0.0
        return (self.successful_migrations / self.total_attempts) * 100

    def get_avg_latency(self) -> float:
        if self.successful_migrations == 0:
            return 0.0
        return self.total_latency_ms / self.successful_migrations

def handle_migration_webhook(payload: dict, metrics: MigrationMetrics) -> dict:
    """Process session migrated webhook and update orchestration engine."""
    event_type = payload.get("eventType")
    if event_type != "conversation.media.migrated":
        return {"status": "ignored", "reason": "unrelated_event"}
    
    conversation_id = payload.get("conversationId")
    voice_conversation_id = payload.get("voiceConversationId")
    migration_status = payload.get("status")
    
    # Update external orchestration engine (simulated)
    sync_result = {
        "conversation_id": conversation_id,
        "voice_conversation_id": voice_conversation_id,
        "migrated_at": datetime.utcnow().isoformat(),
        "status": migration_status
    }
    
    logger.info(f"Webhook synchronized: {sync_result}")
    metrics.record_attempt(0.0, True)  # Webhook confirms final success
    return {"status": "synchronized", "data": sync_result}

The handle_migration_webhook function validates the eventType field and extracts the voice conversation identifier. This identifier allows your external orchestration engine to attach the voice leg to the original messaging context. The MigrationMetrics class tracks bridge success rates and average latency for channel governance reporting.

Complete Working Example

The following script combines all components into a single, runnable session migrator module. Replace the environment variables with your Genesys Cloud credentials and external service endpoints.

import os
import logging
import time
import httpx
import phonenumbers
from phonenumbers import NumberParseException
from pydantic import BaseModel, validator
from typing import Optional
from genesyscloud import PureCloudPlatformClientV2, MessagingApi, MediaMigrationRequest

logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
logger = logging.getLogger(__name__)

class MigrationPayload(BaseModel):
    conversation_id: str
    target_phone_number: str
    callback_url: str
    customer_consent_id: Optional[str] = None

    @validator("target_phone_number")
    def validate_e164(cls, v: str) -> str:
        try:
            parsed = phonenumbers.parse(v, None)
            if not phonenumbers.is_valid_number(parsed):
                raise ValueError("Invalid phone number format")
            return phonenumbers.format_number(parsed, phonenumbers.PhoneNumberFormat.E164)
        except NumberParseException as e:
            raise ValueError(f"Phone number parsing failed: {e}")

class MigrationMetrics:
    def __init__(self):
        self.total_attempts = 0
        self.successful_migrations = 0
        self.total_latency_ms = 0.0

    def record_attempt(self, latency_ms: float, success: bool):
        self.total_attempts += 1
        if success:
            self.successful_migrations += 1
            self.total_latency_ms += latency_ms

    def get_success_rate(self) -> float:
        return (self.successful_migrations / self.total_attempts) * 100 if self.total_attempts > 0 else 0.0

    def get_avg_latency(self) -> float:
        return self.total_latency_ms / self.successful_migrations if self.successful_migrations > 0 else 0.0

def init_genesys_client() -> PureCloudPlatformClientV2:
    return PureCloudPlatformClientV2(
        environment=os.getenv("GENESYS_ENVIRONMENT", "https://api.mypurecloud.com"),
        client_id=os.getenv("GENESYS_CLIENT_ID"),
        client_secret=os.getenv("GENESYS_CLIENT_SECRET")
    )

def check_media_switch_limit(client: PureCloudPlatformClientV2, conversation_id: str) -> bool:
    messaging_api = MessagingApi(client)
    try:
        conv = messaging_api.get_conversations_messaging_conversation(conversation_id)
        if hasattr(conv, 'media_migration_status') and conv.media_migration_status in ["migrated", "initiated"]:
            return False
        return True
    except Exception as e:
        raise RuntimeError(f"Conversation state check failed: {e}")

def verify_customer_consent(consent_id: str, external_endpoint: str) -> bool:
    if not consent_id:
        return True
    try:
        with httpx.Client(timeout=5.0) as client:
            response = client.get(f"{external_endpoint}/consent/{consent_id}")
            response.raise_for_status()
            data = response.json()
            return data.get("is_active", False) and data.get("channels", {}).get("voice", False)
    except httpx.HTTPError as e:
        logger.error(f"Consent verification failed: {e}")
        return False

def calculate_sip_uri(e164_number: str) -> str:
    clean_number = e164_number.lstrip("+")
    return f"sip:{clean_number}@sip.genesyscloud.com"

def execute_migration_with_retry(
    client: PureCloudPlatformClientV2,
    payload: MigrationPayload,
    max_retries: int = 3,
    base_delay: float = 1.0
) -> dict:
    messaging_api = MessagingApi(client)
    sip_uri = calculate_sip_uri(payload.target_phone_number)
    
    request_body = MediaMigrationRequest(
        conversation_id=payload.conversation_id,
        media_migration_type="voice",
        target_phone_number=payload.target_phone_number,
        callback_url=payload.callback_url
    )
    
    for attempt in range(max_retries):
        try:
            start_time = time.time()
            response = messaging_api.post_conversations_messaging_mediamigration(request_body)
            latency_ms = (time.time() - start_time) * 1000
            
            audit_entry = {
                "conversation_id": payload.conversation_id,
                "sip_uri": sip_uri,
                "migration_id": response.migration_id if hasattr(response, "migration_id") else "unknown",
                "voice_conversation_id": response.voice_conversation_id if hasattr(response, "voice_conversation_id") else None,
                "status": "success",
                "latency_ms": round(latency_ms, 2),
                "attempt": attempt + 1
            }
            logger.info(f"Migration successful: {audit_entry}")
            return audit_entry
            
        except Exception as e:
            error_msg = str(e)
            if "429" in error_msg or "rate limit" in error_msg.lower():
                delay = base_delay * (2 ** attempt)
                logger.warning(f"Rate limited on attempt {attempt + 1}. Retrying in {delay}s")
                time.sleep(delay)
                continue
            elif any(code in error_msg for code in ["400", "403", "409"]):
                raise RuntimeError(f"Client error during migration: {error_msg}")
            else:
                raise RuntimeError(f"Server error during migration: {error_msg}")
    
    raise RuntimeError("Max retries exceeded for media migration")

def handle_migration_webhook(payload: dict, metrics: MigrationMetrics) -> dict:
    if payload.get("eventType") != "conversation.media.migrated":
        return {"status": "ignored", "reason": "unrelated_event"}
    
    sync_result = {
        "conversation_id": payload.get("conversationId"),
        "voice_conversation_id": payload.get("voiceConversationId"),
        "migrated_at": time.time(),
        "status": payload.get("status")
    }
    logger.info(f"Webhook synchronized: {sync_result}")
    metrics.record_attempt(0.0, True)
    return {"status": "synchronized", "data": sync_result}

def run_migration_pipeline():
    client = init_genesys_client()
    metrics = MigrationMetrics()
    
    payload = MigrationPayload(
        conversation_id=os.getenv("TARGET_CONVERSATION_ID"),
        target_phone_number=os.getenv("TARGET_PHONE_NUMBER"),
        callback_url=os.getenv("WEBHOOK_CALLBACK_URL"),
        customer_consent_id=os.getenv("CONSENT_ID")
    )
    
    if not check_media_switch_limit(client, payload.conversation_id):
        raise RuntimeError("Conversation already migrated. Maximum media switch limit reached.")
    
    if not verify_customer_consent(payload.customer_consent_id, os.getenv("CONSENT_SERVICE_URL", "https://consent.example.com")):
        raise RuntimeError("Customer consent verification failed.")
    
    audit_log = execute_migration_with_retry(client, payload)
    metrics.record_attempt(audit_log["latency_ms"], True)
    
    logger.info(f"Migration complete. Success rate: {metrics.get_success_rate():.2f}%, Avg latency: {metrics.get_avg_latency():.2f}ms")
    return audit_log

if __name__ == "__main__":
    run_migration_pipeline()

Common Errors & Debugging

Error: 409 Conflict

• Cause: The conversation has already undergone media migration. Genesys Cloud enforces a single migration per conversation lifecycle.
• Fix: Verify the media_migration_status field before calling the API. Use the check_media_switch_limit function to short-circuit invalid requests.
• Code Fix: The validation pipeline in Step 1 prevents this by inspecting the conversation resource prior to POST execution.

Error: 400 Bad Request

• Cause: Malformed phone number, invalid callback URL, or unsupported mediaMigrationType.
• Fix: Ensure the target phone number uses E.164 format. Validate the callback URL scheme. Confirm mediaMigrationType is exactly voice.
• Code Fix: The Pydantic validator in MigrationPayload rejects non-E.164 numbers at initialization. The SDK serializes the request body with strict schema enforcement.

Error: 401 Unauthorized or 403 Forbidden

• Cause: Missing or expired OAuth token, or insufficient scopes.
• Fix: Verify the client credentials. Ensure the OAuth application includes messaging:conversation:write and telephony:phone:read.
• Code Fix: The PureCloudPlatformClientV2 automatically refreshes tokens. If the error persists, rotate the client secret and verify scope assignment in the Genesys Cloud admin console.

Error: 429 Too Many Requests

• Cause: API rate limit exceeded during scaling events or rapid migration iterations.
• Fix: Implement exponential backoff. Reduce concurrent migration requests.
• Code Fix: The execute_migration_with_retry function catches 429 responses and applies exponential delay before retrying.

Official References

• Media Migration API Documentation
• Genesys Cloud Python SDK Reference
• OAuth 2.0 Client Credentials Flow
• Webhook Event Types Reference