<s>[INST] I'm looking to migrate my Asterisk system, but I'm loath to lose my existing phone system features.

Here are some key points that are driving the migration:

1. **Age and Hardware Reliability** ( Current system outdated and eventually will be difficult to find compatible hardware)
2. **Security concerns** ( Release candidate quality, lack of support and SSL cert issues)
3. **Maintenance overhead** (we have had issues with dial rules, queue, and IVR prompts that require.horizontal extensive troubleshooting and management) 
4. **Technical debt ( internal expertise diminishing)**

To mitigate these challenges, I'd like to explore alternatives that offer:
1. **Proven and actively maintained software/ technology stack**
2. **Contact Center or call handling that replicates our current features**
3. **Cost-effective solution**
4. **Migration pathway that is least disruptive**
5. **Easier maintenance & troubleshooting processes**

Can you help me identify the best approach?[/INST]