Call flow IP phone and PSTN

[Arjun Kamble]

Hi All,

Can somebody elaborate the call flow of outgoing call from Ip phone to PSTN and incoming call from PSTN to ip phone. Please provide me information as step by step.

1] Outgoing: IP phone to PSTN

2] Outgoing: IP phone to IP phone

3] Incoming: PSTN to IP phone

4] Incoming: IP phone to IP phone

Thank you,

Arjun Kamble

[Pal, Yash]

It completely depends on what VOIP environment do you have, if you have a Cisco VOIP (CUCM)environment then please find the flow below as per the given scenario:-

1) For outbound PSTN call from Cisco IP phone:- Cisco IP phone/DN->CUCM->H.323/MGCP/SIP Gateway->PSTN

2) For Inbound to Cisco IP phone from PSTN number:- PSTN->Telco/Mobile Operator->H.323/MGCP/SIP Gateway->CUCM->Cisco IP phone/DN

3) For Outbound IP phone to IP phone/VOIP call-> Cisco IP phone/DN-CUCM->Cisco IP phone/DN

4) For Inbound IP phone to IP phone/VOIP call-> Cisco IP phone/DN-CUCM->Cisco IP phone/DN

Above explained flows are just basic overview that how the calls flow in different scenarios however there are lots of technical stuffs involved behind these call flows.

I hope it helps you.