+-Additional update result value ::= CHOICE Įxample 1 : Overal Procedure for VoLTE (Both Radio Signaling and IMS Signaling)įollowing is the very simplified procedure of protocol sequence from UE Power On to VoLTE Call Setup. +-Additional update result ::= TV OPTIONAL:Omit IMS voice over PS session in S1 mode not supported IMS voice over PS session in S1 mode supported | | +-Length of EPS network feature support contents ::= LEN (0.255) | | +-EPS network feature support IEI ::= IEI +-EPS network feature support ::= TLV OPTIONAL:Exist IMS PS Voice Prefered CS Voice as Secondary +-Voice domain preference for E-UTRAN ::= CHOICE ĬS Voice Prefered IMS PS Voice as Secondary | +-Length of Voice domain preference and UE's usage setting contents ::= LEN (0.255) | +-Voice domain preference and UE's usage setting IEI ::= IEI +-Voice domain preference and UE's usage setting ::= TLV OPTIONAL:Exist | +- SRVCC to GERAN/UTRAN capability ::= CHOICE [SRVCC from UTRAN HSPA or E-UTRAN to +-MS network capability ::= TLV OPTIONAL:Exist Followings would be the most common configuration in very high level view. There can be almost inifinite number of variations in terms of radio stack configurations for VoLTE over. Precondition /Full Sequence Example 1 : MO VoLTE with PreCondition.No Precondition (including IMS Registration with Authentication) : MO Call/MO Release-Plain Text/Log Only.If you are interested in more details of each of these messages and parameters, refer to following links (With VoLTE in real network, you would not see this kind of simplified log since most of live network would enable Authentication and require Precondition)Īctually each of the SIP message shown above has a lot of details and desribed acorss multiple specification. This log were captured under following conditon. One common transaction for VoLTE at SIP/IMS layer would be as shown below, but the detailed implementation may vary on the requirement from Carriers.įollowing is a very basic SIP sequence from IMS Registration through VoLTE. SIP/IMS Transaction - Overall SIP/IMS Sequence Example 1 : Overal Procedure for VoLTE (Both Radio Signaling and IMS Signaling).SIP/IMS Transaction - Overall SIP/IMS Sequence.One is about Application Layer (SIP/IMS Layer) and the other one is about Access Network Layer (Radio Layer).įollowing is the topics that I will talk about in this page. When we are thinking about VoLTE, we have to look into two layers. Is just 'best effort' type of application which can hardly be optimized for voice traffic and no guaranteed quality of service. The simple answer is that VoLTE over IMS can be specially optimized for voice traffic not only in terms of core network but also in terms of radio stack, whereas generic IP based voice call Then what would be the difference between VoLTE and generic IP based voice call. Theoretically you can use the IP/SIP based application for voice call on LTE as you do with your PC and other IP phone. Are they talking about 'general voice technology implementation over LTE' or "Voice over LTE utilizing IMS" (You would need to read the context to figure out what they say. But when people say "VoLTE" (in abbreviation) it usually mean "Voice over LTE utilizing IMS". VoLTE literally stands for "Voice over LTE".
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