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One important use of attributes in a VoIP application is provided by the rtpmap attribute This attribute can be applied to a media stream and is particularly useful when the media format is not a static RTP payload type rtpmap has the format
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a=rtpmap:<payload type> <encoding name>/<clock rate>[/<encoding parameters>]
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The Session Initiation Protocol (SIP)
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The payload type corresponds to the RTP payload type The encoding name is a text string RTP profiles that specify the use of dynamic payload types must define the set of valid encoding names and/or a means to register encoding names if that profile is to be used with SDP The clock rate is the rate in Hz The optional encoding parameters may be used to indicate the number of audio channels Strictly speaking, the rtpmap attribute is only necessary for dynamic payload types For example, standard G711 speech is a static RTP payload type and would be fully described by a media field such as
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m=audio 45678 RTP/AVP 0
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A dynamic RTP payload type needs greater information for the remote end to fully understand the media coding, however An example of such a dynamic payload type is 16-bit linear encoded stereo (2 channels) audio sampled at 16 kHz If we want to use dynamic RTP/AVP payload type value 98 for such a stream, then the media description must be followed by an rtpmap attribute as follows:
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m=video 45678 RTP/AVP 98 a=rtpmap 98 L16/16000/2
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If multiple payload types are indicated by the media description, then a separate rtpmap attribute may be specified for each Although the rtpmap attribute is not necessary for static RTP payload types, SIP recommends that the attribute always be included when SDP is used for a SIP message body, even in the case of static payload types
Usage of SDP with SIP
SIP and SDP make a wonderful partnership for the transmission of session information SIP provides the messaging mechanisms for the establishment of multimedia sessions and SDP provides a structured language for describing those sessions The message body in SIP, identified by the entity headers, provides a neat slot where SDP can be used It is this usage that this section will discuss SIP uses SDP in an offer/answer model The initiator of a session offers a selection of media formats to be used in the session The receiver of the offer either rejects the offer completely or selects those media formats that have been offered and which the responder is willing to accept If the
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The Session Initiation Protocol (SIP)
The Session Initiation Protocol (SIP)
responder agrees to participate in the session, then the response to the initial offer (a SIP INVITE) will include a message body of the same form as the received message body, with an indication as to the acceptance or rejection of each of the offered media types If we take the example outlined in Figure 5-9 and assume that Collins can support voice coded according to G726, G7231, or G728 and we assume that Boss can only support voice coded according to G728, then the messages would appear as shown in Figure 5-15 For avoidance of clutter, a number of header fields (such as Via:) have been omitted, as has the 180 (Ringing) response These would be included according to Figure 5-9 In Figure 5-15, the message body of the INVITE lists the individual media formats separately, port numbers at which Daniel wants to receive each of the formats, and an rtpmap attribute exists for each media format The message body of the 200 (OK) response also lists the media formats individually in the same order as received in the INVITE In this example, Boss can support only G728 and is rejecting the other two media formats This rejection is indicated by specifying port number zero for each rejected media format The fact that Boss is willing to accept G728 is indicated by the fact that the associated port number (6666 in our example) is nonzero The 6666 port number is the port at which Boss is willing to receive the G728 RTP media stream Since both parties can support the same media format, and each knows the port number at which the other party wishes to receive the media, media exchange (conversation) can take place In Figure 5-15, each of the offered media formats was listed in a separate line with a separate port number associated with each format If Daniel wants to receive only one of the offered media formats and to reserve just a single number (port number 4444, for example), then the media part of the offer could be as follows:
m=audio 4444 RTP/AVP 2 4 15 a=rtpmap 2 G726-32/8000 a=rtpmap 4 G723/8000 a=rtpmap 15 G728/8000
This syntax indicates that Daniel wants to use G726 (2), G723 (4), or G728 (15) in that order of preference, and he wants to receive the media stream at port number 4444 If Boss is to respond to such an offer, then the response would have the following format (again assuming that Boss chooses only G728):
m=audio 6666 RTP/AVP 15 a=rtpmap 15 G728/8000
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The Session Initiation Protocol (SIP)
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