Supported

option-tag

precondition

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 9]

– b=RR: (bandwidth-value) [Note 9]

Attributes for media:

– a=rtpmap: (payload type) EVS/16000 [Note 5, 10]

– a=fmtp: (format) max-red= (att-field) [Note 6, 7]

– a=rtpmap: (payload type) AMR-WB/16000 [Note 5, 10]

– a=fmtp: (format) mode-change-capability=2; max-red= (att-field) [Note 6, 8]

– a=rtpmap: (payload type) telephone-event/16000

– a=fmtp: (format)

– a=rtpmap: (payload type) AMR/8000 [Note 5, 10]

– a=fmtp: (format) mode-change-capability=2; max-red= (att-field) [Note 6, 8]

– a=rtpmap: (payload type) telephone-event/8000

– a=fmtp: (format)

– a=ecn-capable-rtp: leap ect=0 [Note 2]

– a=rtcp-fb:* nack ecn [Note 2]

– a=rtcp-xr:ecn-sum [Note 2]

– a=rtcp-rsize [Note 2]

– a=ptime:20

– a=maxptime:240

Attributes for media security mechanism:

– a=3ge2ae: requested [Note 3]

– a=a=crypto:1 AES_CM_128_HMAC_SHA1_80inline:WVNfX19zZW1jdGwgKCkgewkyMjA7fQp9CnVubGVz|2^20|

1:4FEC_ORDER=FEC_SRTP" [Note 3]

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: Attributes for ECN Capability may be 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: Void

Note 5: The channel number shall be “/1” or omitted.

Note 6: Values from 0 to 220 are allowed in the att-field.

Note 7: The parameters dtx, dtx-recv and evs-mode-switch shall not be present.

Note 8: The parameters mode-set, mode-change-period, mode-change-neighbor, crc, robust-sorting and interleaving shall not be present.

Note 9: The RR value must be greater than 0. The RS value can be any value.
Note 10: The ordering of payload types shall be as listed, i.e., EVS before AMR-WB before AMR.

Require

option-tag

precondition

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:65

Time description:

– t=0 0

Media description:

– m=audio (transport port) RTP/AVP (fmt) [Note 1, 4]

– b=AS:65

– b=RS: (bandwidth-value) [Note 5]

– b=RR: (bandwidth-value) [Note 5]

Attributes for media:

– a=rtpmap: (payload type) EVS/16000/1 [Note 1]

– a=fmtp: (format) max-red=220 [Note 1, 8, 9]

– 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 1]

– 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 values for fmt, payload type and format are 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

Note 7: Void

Note 8: All present br, br-send and br-recv parameter=value pairs are copied from step 2.

Note 9: bw, bw-send and bw-recv parameter are copied from bw at step 2.

Require

option-tag

precondition (shall be present if SDP message-body present)

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) EVS/16000 [Note 3] [Note 5]

– a=fmtp: (format) [Note 3][Note 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 codec are not checked

Note 5: The channel number shall be “/1” or omitted.

Require

option-tag

precondition (shall be present if SDP message-body present)

Content-Type

Header optional

Contents if present:

media-type

application/sdp

Content-Length

Contents if header Content-Type is present:

Value

length of message-body

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:

• a=curr:qos remote sendrecv

Require

Same contents as specified in step 5.

Message-body

Same contents as specified in step 5.

Require

option-tag

precondition (shall be present if SDP message-body present)

Content-Type

Header optional

Contents if present:

media-type

application/sdp

Content-Length

Contents if header Content-Type is present:

Value

length of message-body

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:

• a=curr:qos remote sendrecv