# RFC 4964: The P-Answer-State Header Extension to the Session Initiation Protocol for the Open Mobile Alliance Push to Talk over Cellular

> request for comments publication

**Wikidata**: [Q47479358](https://www.wikidata.org/wiki/Q47479358)  
**Source**: https://4ort.xyz/entity/rfc-4964-the-p-answer-state-header-extension-to-the-session-initiation-protocol-for-the-open-mobile-alliance-push-to-talk-over-cellular


## References

1. RFC Index
2. DBLP Dataset 2021-01-02