B.3 Example 2

29.2143GPPPolicy and charging control over Rx reference pointRelease 17TS

In the general case, multiple ports may be specified with a "number of ports" qualifier as follows, RFC 2327 [17]:

m=<media> <port>/<number of ports> <transport> <fmt list>

An UE, as the offerer, sends a SDP session description, as shown in table B.3.1, to an application server (only relevant SDP parameters are shown):

Table B.3.1: The values of the SDP parameters sent by the UE in example 2.

v=0
o=ecsreid 3262464321 3262464325 IN IP6 2001:0646:00F1:0045:02D0:59FF:FE14:F33A
s=MM02
i=One unidirectional audio media consisting of two media IP flows described by one media component
t=3262377600 3262809600
m=audio 50330/2 RTP/AVP 0
c=IN IP6 2001:0646:00F1:0045:02D0:59FF:FE14:F33A
a=recvonly

and receives the SDP parameters, as shown in table B.3.2, from the application server:

Table B.3.2: The values of the SDP parameters sent by the application server in example 2.

v=0
o=ecsreid 3262464321 3262464325 IN IP6 2001:0646:00F1:0045:02D0:59FF:FE14:F33A
s=MM02
i=One unidirectional audio media consisting of two media IP flows described by one media component
t=3262377600 3262809600
m=audio 49170/2 RTP/AVP 0
c=IN IP6 2001:0646:000A:03A7:02D0:59FF:FE40:2014
a=sendonly

From this offer–answer exchange of SDP parameters the UE and the PCRF each creates a list of flow identifiers comprising the IP flows as shown in table B.3.3:

Table B.3.3: Flow identifiers in example 2.

Order of ‘m=’-line

Type of IP flows

Destination IP address / Port number of the IP flows

Flow identifier

1

RTP (audio) DL

2001:0646:00F1:0045:02D0:59FF:FE14:F33A / 50330

<1,1>

1

RTCP DL

2001:0646:00F1:0045:02D0:59FF:FE14:F33A / 50331

<1,2>

1

RTCP UL

2001:0646:000A:03A7:02D0:59FF:FE40:2014 / 49171

<1,2>

1

RTP (audio) DL

2001:0646:00F1:0045:02D0:59FF:FE14:F33A / 50332

<1,3>

1

RTCP DL

2001:0646:00F1:0045:02D0:59FF:FE14:F33A / 50333

<1,4>

1

RTCP UL

2001:0646:000A:03A7:02D0:59FF:FE40:2014 / 49173

<1,4>