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Content for  TS 23.172  Word version:  18.0.0

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4.3.4 Originating side - completion of call setup 
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4.3.4  Originating side - completion of call setup  p. 39

The originating MSC receives the Selected Codec and the list of available codecs, and, depending on the active mode, shall do the following:
The call was set up with a multimedia BC-IE first:
  • if the Selected Codec is the 3G-324.M codec, no In-Call Modification procedure is necessary (see Figure 4.23). If no speech codecs are included in the list of available codecs, all In-Call Modification procedures initiated by the UE using the speech BC-IE shall be rejected with a MODIFY REJECT message;
  • if the Selected Codec is a speech codec, an In-Call Modification procedure to change to speech mode shall take place (see Figure 4.24). If the 3G-324.M codec is not included in the list of available codecs, all In-Call Modification procedures initiated by the UE using the multimedia BC-IE shall be rejected with a MODIFY REJECT message.
The call was set up with a speech BC-IE first:
  • if the Selected Codec is the 3G-324.M codec, an In-Call Modification procedure to change to multimedia mode shall take place (see Figure 4.25). If no speech codecs are included in the list of available codecs, all In-Call Modification procedures initiated by the UE using the speech BC-IE shall be rejected with a MODIFY REJECT message;
  • if the Selected Codec is a speech codec, no In-Call Modification procedure is necessary (see Figure 4.26). If the 3G-324.M codec is not included in the list of available codecs, all In-Call Modification procedures initiated by the UE using the multimedia BC-IE shall be rejected with a MODIFY REJECT message.
Copy of original 3GPP image for 3GPP TS 23.172, Fig. 4.23: Multimedia preferred, selected
Figure 4.23: Multimedia preferred, selected
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.172, Fig. 4.24: Multimedia preferred, speech selected
Figure 4.24: Multimedia preferred, speech selected
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.172, Fig. 4.25: Speech preferred, multimedia selected
Figure 4.25: Speech preferred, multimedia selected
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.172, Fig. 4.26: Speech preferred, selected
Figure 4.26: Speech preferred, selected
(⇒ copy of original 3GPP image)
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