Parallel Mode – all phones ring concurrently following just one phone responses, the remainder of the telephones will be able to put new phone calls
This can be the cause Grandstream PBX is modern. on account of https://hamzahcmne297678.develop-blog.com/35600915/5-easy-facts-about-grandstream-dubai-grandstream-grandstream-africa-grandstream-phones-ip-pbx-ip-phone-gsm-gateway-described