C.21a Generic test procedure for MTSI MO speech call – WLAN access to EPC
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 wait for 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 180 Ringing response.
5) SS waits for the UE to send a PRACK request.
6) SS responds to the PRACK request with a 200 OK.
7) SS responds to the INVITE request with a 200 OK.
8) 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 |
🡨 |
180 Ringing |
SS sends Ringing with an SDP answer. |
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5 |
🡪 |
PRACK |
UE acknowledges. |
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6 |
🡨 |
200 OK |
SS sends a 200 OK response for PRACK. |
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7 |
🡨 |
200 OK |
SS sends a 200 OK for INVITE. |
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8 |
🡪 |
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 4] – b=RR: (bandwidth-value) [Note 4] Attributes for media: – a=rtpmap: (payload type) AMR-WB/16000 [Note 2] – a=fmtp: (format) mode-change-capability=2; max-red=(att-field) [Note 3, 5] – a=rtpmap: (payload type) telephone-event/16000 – a=fmtp: (format) – a=rtpmap: (payload type) AMR/8000 [Note 2] – a=fmtp: (format) mode-change-capability=2; max-red=(att-field) [Note 3, 5] – a=rtpmap: (payload type) telephone-event/8000 – a=fmtp: (format) – a=ptime:20 – a=maxptime:240 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 Note 1: At least one "c=" field shall be present. Note 2: The AMR channel number shall be “/1” or omitted. Note 3: The max-red values from 0 to 220 are allowed. Note 4: The RR value must be greater than 0. The RS value can be any value. Note 5: The parameters mode-set, mode-change-period, mode-change-neighbor, crc, robust-sorting and interleaving shall not be included. |
180 Ringing (Step 4)
Use the default message "180 Ringing" in annex A.2.6 with the following exceptions:
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Header/param |
Value/Remark |
|
Require |
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option-tag |
precondition |
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Content-Type |
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media-type |
application/sdp |
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Content-Length |
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value |
length of message-body |
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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, 2] – b=AS: 37 – b=RS: (bandwidth-value) [Note 3] – b=RR: (bandwidth-value) [Note 3] Attributes for media: – a=rtpmap: (payload type) AMR-WB/16000 [Note 1] – a=fmtp: (format) mode-change-capability=2; max-red=220 [Note 1] – a=ptime:20 – a=maxptime:240 Attributes for preconditions: – a=curr:qos local sendrecv – a=curr:qos remote sendrecv – a=des:qos mandatory local sendrecv – a=des:qos mandatory remote sendrecv Note 1: The value for fmt, payload type (AMR) and format is copied from step 2. Note 2: Transport port is the port number of the SS (see RFC 3264 clause 6). Note 3: The bandwidth-value is copied from step 2. |