C.21 Generic test procedure for setting up MTSI MO speech call – EPS
34.229-13GPPInternet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Part 1: Protocol conformance specificationRelease 16TSUser Equipment (UE) conformance specification
Test procedure:
1) MO speech is initiated on the UE. The call is initiated towards the URI configured to SS as px_IMS_CalleeUri. Depending on the UE support this URI may be either SIP or Tel URI, possibly containing a dialstring indicating a global, home local or geo-local telephone number. SS waits the UE to send an INVITE request with first SDP offer
2) UE sends an INVITE request to the SS.
3) SS responds to the INVITE request with a 100 Trying response.
4) SS responds to the INVITE request with a 183 Session Progress response.
5) SS waits for the UE to send a PRACK request possibly containing the second SDP offer.
6) SS responds to the PRACK request with a 200 OK.
7) SS waits for the UE to send a UPDATE request containing the final SDP offer.
8) SS responds to the UPDATE request with a 200 OK.
9) SS responds to the INVITE request with a 180 Ringing.
10) SS waits for the UE to send a PRACK request.
11) SS responds to the PRACK request with a 200 OK.
12) SS responds to the INVITE request with a 200 OK.
13) SS waits for the UE to send an ACK to acknowledge receipt of the 200 OK for INVITE.
Expected sequence:
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Step |
Direction |
Message |
Comment |
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UE |
SS |
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1 |
Make the UE attempt an IMS speech call |
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2 |
🡪 |
INVITE |
UE sends INVITE with the first SDP offer. |
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3 |
🡨 |
100 Trying |
SS sends a 100 Trying provisional response. |
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4 |
🡨 |
183 Session Progress |
SS sends an SDP answer. |
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5 |
🡪 |
PRACK |
UE acknowledges and optionally offers a second SDP if a dedicated EPS bearer is established by the network. |
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6 |
🡨 |
200 OK |
SS sends a 200 OK and answers the second SDP if present. |
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7 |
🡪 |
UPDATE |
Optional step: UE sends a second SDP if a dedicated EPS bearer is established by the network. |
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8 |
🡨 |
200 OK |
Optional step: SS sends a 200 OK. |
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9 |
🡨 |
180 Ringing |
SS sends a 180 Ringing. |
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10 |
🡪 |
PRACK |
UE acknowledges. |
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11 |
🡨 |
200 OK |
SS responds PRACK with 200 OK. |
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12 |
🡨 |
200 OK |
SS responds INVITE with 200 OK. |
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13 |
🡪 |
ACK |
UE acknowledges. |
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Specific Message Contents
INVITE (Step 2)
Use the default message “INVITE for MO Call” in annex A.2.1 with the following exceptions:
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Header/param |
Value/Remark |
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Supported |
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option-tag |
precondition |
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Message-body |
The following SDP types and values. Session description: – v=0 – o=(username) (sess-id) (sess-version) IN (addrtype) (unicast-address for UE) – s=(session name) – c=IN (addrtype) (connection-address for UE) [Note 1] – b=AS: (bandwidth-value) Time description: – t= (start-time) (stop-time) Media description: – m=audio (transport port) RTP/AVP (fmt) – c=IN (addrtype) (connection-address for UE) [Note 1] – b=AS: (bandwidth-value) – b=RS: (bandwidth-value) [Note 7] – b=RR: (bandwidth-value) [Note 7] Attributes for media: – a=rtpmap: (payload type) AMR-WB/16000 [Note 8] – a=fmtp: (format) mode-change-capability=2; max-red= (att-field) [Note 9, 10] – a=rtpmap: (payload type) telephone-event/16000 – a=fmtp: (format) – a=rtpmap: (payload type) AMR/8000 [Note 8] – a=fmtp: (format) mode-change-capability=2; max-red= (att-field) [Note 9, 10] – a=rtpmap: (payload type) telephone-event/8000 – a=fmtp: (format) – a=ecn-capable-rtp: leap ect=0 [Note 3] – a=rtcp-fb:* nack ecn [Note 3] – a=rtcp-xr:ecn-sum [Note 3] – a=rtcp-rsize [Note 3] – a=ptime:20 – a=maxptime:240 Attributes for media security mechanism: – a=3ge2ae: requested [Note 4] – a=crypto:1 AES_CM_128_HMAC_SHA1_80inline:WVNfX19zZW1jdGwgKCkgewkyMjA7fQp9CnVubGVz|2^20| 1:4FEC_ORDER=FEC_SRTP" [Note 4] Attributes for preconditions: – a=curr:qos local none – a=curr:qos remote none – a=des:qos mandatory local sendrecv – a=des:qos optional remote sendrecv Note 1: At least one "c=" field shall be present. Note 2: Void. Note 3: Attributes for ECN Capability may be present if the UE supports Explicit Congestion Notification. Note 4: Attributes for media plane security are present if the use of end-to-access-edge security is supported by UE. Note 5: Void. Note 6: Void. Note 7: The RR value must be greater than 0. The RS value can be any value. Note 8: The AMR channel number shall be “/1” or omitted. Note 9: The max-red values from 0 to 220 are allowed. Note 10: The parameters mode-set, mode-change-period, mode-change-neighbor, crc, robust-sorting and interleaving shall not be included. |
183 Session Progress (Step 4)
Use the default message "183 Session Progress" in annex A.2.3 with the following exceptions:
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Header/param |
Value/Remark |
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Require |
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option-tag |
precondition |
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Message-body |
The following SDP types and values. Session description: – v=0 – o=- 1111111111 1111111111 IN (addrtype) (unicast-address for SS) – s=- – c=IN (addrtype) (connection-address for SS) – b=AS:37 Time description: – t=0 0 Media description: – m=audio (transport port) RTP/AVP (fmt) [Note 1, 4] – b=AS:37 – b=RS: (bandwidth-value) [Note 5] – b=RR: (bandwidth-value) [Note 5] Attributes for media: – a=rtpmap: (payload type) AMR-WB/16000/1 [Note 1] – a=fmtp: (format) mode-change-capability=2; max-red=220 [Note 1] – a=ecn-capable-rtp: leap ect=0 [Note 2] – a=rtcp-fb:* nack ecn [Note 2] – a=rtcp-xr:ecn-sum [Note 2] – a=ptime:20 – a=maxptime:240 Attributes for media security mechanism: – a=3ge2ae: requested [Note 3] – a=crypto:1 AES_CM_128_HMAC_SHA1_80inline:PS1uQCVeeCFCanVmcjkpPywjNWhcYD0mXXtxaVBR|2^20|1:4 [Note 3] Attributes for preconditions: – a=curr:qos local none – a=curr:qos remote none – a=des:qos mandatory local sendrecv – a=des:qos mandatory remote sendrecv – a=conf:qos remote sendrecv Note 1: The value for fmt, payload type (AMR) and format is copied from step 2. Note 2: Attributes for ECN Capability are present if the UE supports Explicit Congestion Notification. Note 3: Attributes for media plane security are present if the use of end-to-access-edge security is supported by UE. Note 4: transport port is the port number of the SS (see RFC 3264 clause 6). Note 5: The bandwidth-value is copied from step 2. Note 6: Void |
PRACK (Step 5)
Use the default message “PRACK” in annex A.2.4 with the following exceptions:
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Header/param |
Value/Remark |
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Require option-tag |
precondition (shall be present if SDP message-body present) |
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Message-body |
Header optional Contents if present: The following SDP types and values shall be present. Session description: – v=0 – o=(username) (sess-id) (sess-version) IN (addrtype) (unicast-address for UE) [Note 2] – s=(session name) – c=IN (addrtype) (connection-address for UE) [Note 1] – b=AS: (bandwidth-value) Time description: – t=0 0 Media description: – m=audio (transport port) RTP/AVP (fmt) [Note 3] – c=IN (addrtype) (connection-address for UE) [Note 1] – b=AS: (bandwidth-value) – b=RS: (bandwidth-value) – b=RR: (bandwidth-value) Attributes for media: – a=rtpmap: (payload type) AMR-WB/16000 [Note 3] [Note 5] – a=fmtp: (format) [Note 3, 4] Attributes for preconditions: – a=curr:qos local sendrecv – a=curr:qos remote none – a=des:qos mandatory local sendrecv – a=des:qos optional remote sendrecv or a=des:qos mandatory remote sendrecv Note 1: At least one "c=" field shall be present. Note 2: "o=" line identical to previous SDP sent by UE except that sess-version is incremented by one. Note 3: The value for fmt, payload type and format is not checked Note 4: Parameters for the AMR codec are not checked Note 5: The AMR channel number shall be “/1” or omitted. |
200 OK for PRACK (Step 6)
Use the default message “200 OK for other requests than REGISTER or SUBSCRIBE” in annex A.3.1 with the following exceptions:
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Header/param |
Value/remark |
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Require option-tag |
precondition (shall be present if SDP message-body present) |
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Content-Type |
Header optional Contents if present: |
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media-type |
application/sdp |
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Content-Length |
Contents if header Content-Type is present: |
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Value |
length of message-body |
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Message-body |
Header present if Prack (step 5) contained SDP. Contents if present: SDP body of the 200 OK response copied from the received PRACK and modified as follows: – IP address on "c=" lines and transport port on "m=" lines changed to indicate to which IP address and port the UE should start sending the media; – "o=" line identical to previous SDP sent by SS except that sess-version is incremented. Attributes for preconditions:
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UPDATE (Step 7)
Use the default message “UPDATE” in annex A.2.5 with the following exceptions:
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Header/param |
Value/remark |
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Require |
Same contents as specified in step 5. |
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Message-body |
Same contents as specified in step 5. |
200 OK for UPDATE (Step 8)
Use the default message “200 OK for other requests than REGISTER or SUBSCRIBE” in annex A.3.1 with the following exceptions:
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Header/param |
Value/remark |
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Require option-tag |
precondition (shall be present if SDP message-body present) |
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Content-Type |
Header optional Contents if present: |
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media-type |
application/sdp |
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Content-Length |
Contents if header Content-Type is present: |
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Value |
length of message-body |
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Message-body |
SDP body of the 200 response copied from the received UPDATE and modified as follows: – IP address on "c=" lines and transport port on "m=" lines changed to indicate to which IP address and port the UE should start sending the media; – “o=” line identical to previous SDP sent by SS except that sess-version is incremented. Attributes for preconditions:
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180 Ringing (Step 9)
Use the default message “180 Ringing for INVITE” in annex A.2.6 applying condition A3 (Response sent reliably).