Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators. Specification for the procedure of in-service observation for PBXs undergoing type approval
| Accuris | |
|---|---|
| Product Category | Standards and Technical Documents |
| Product Number | BS 6450-7 |
| Product Name | Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators. Specification for the procedure of in-service observation for PBXs u... |