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What is Ecall over IMS support?Anyway there is Emergency call over IMS support then why Ecall?

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What is Ecall over IMS support?Anyway there is Emergency call over IMS support then why Ecall?
posted Aug 21 by Charan Shah

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There is an AVP 1493 (Homogeneous Support of IMS Voice Over PS Sessions) that might be sent or not within ULR message. According to 29.272, this AVP is presented in ULR if either all TA/RA of the MME homogeneously support VoLTE (AVP 1493=Supported) or non of RA/TA of the MME supports VoLTE (AVP 1493=Not_Supported). According to 29.272, the AVP 1493 value =“NOT SUPPORTED” may also indicate the lack of VoLTE roaming agreement between HPMN and VPMN. AVP 1493 is not presented in ULR if some of RA/TA support VoLTE and some not or MME has no info about VoLTE support.

I have several questions:
1. I assume MME will not include the AVP 1493 in ULR if UE has not requested voice over PS. Is this correct?
2. Whether MME inserts the AVP 1493=Not_Supported in ULR towards HPMN when there is no VoLTE roaming agreement irrespectively to UE request for voice over PS or only when UE has requested for voice over PS?
3. How MME decides about VoLTE support on TA/RA level(configuration, dynamic conditions etc.)?
4. What could be scenario when MME has no info about VoLTE support?
5. Whether the case when AVP 1493 is not presented in ULR due to reasons defined in 29.272 is common or it is just intermediate state while VoLTE deployment?

+3 votes

Referring to the 3GPP 29.272 the "Homogeneous Support of IMS Voice Over PS Sessions " AVP is set to TRUE in the ULR means that the serving MME can provide the IMS voice support homogeneously in all TA assigned to it.
Does the MME insert this AVP in the ULR message only if the UE required voice service over IMS during the attach procedure.
In other word, if this AVP is present in the ULR, can we conclude that the UE support Voice call over IMS (VOLTE).

In the same context, if this AVP is absent ("Homogeneous Support of IMS Voice Over PS Sessions ")m can we conclude that either the MME does not support VOLTE at all or the UE does not support it (but only CSFB?

+4 votes

Sometimes due to coverage hole issue in the LTE network, the ongoing VoLTE is continued to UE by using the CS network like GSM network. This is known as SRVCC (Single Radio Voice Call continuity). What messages are exchanged between network nodes when UE moves from LTE to GSM ?

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