[Freeswitch-users] rfc2833 first Marker Bit not set to True on bleg

Sat Apr 28 13:53:47 MSD 2012

On the very latest GIT and previous , Freeswitch doesn't seem to set the
first Marker Bit to true on an rfc2833 event on the bleg of a call out to a
gateway

on the A-leg the first event from my UA to Freeswitch is correct with
duration as 0 and Marker bit set to True. Then the second event increments
the duration and Market bit is set to false.
but on the B-leg from freeswitch to the cisco gateway the first event has
duration 80 (may or may not be a problem) but the Marker bit is set to
False which must be wrong ? Duration then increments and Marker bit remains
false.

I also tried <param name="manual-rtp-bugs" value="START_SEQ_AT_ZERO"/> to
make the duration start at zero but it seemed to have no effect.

*ALEG from SIP UA to FREESWITCH*
No.     Time Source                Destination           Protocol Length
Info
   5254 23   10.0.47.110           10.50.47.30           RTP EVENT 60
Payload type=RTP Event, DTMF One 1

Frame 5254: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)
Ethernet II, Src: Sonicwal_3d:2b:1c (00:06:b1:3d:2b:1c), Dst:
Vmware_ab:60:ec (00:0c:29:ab:60:ec)
Internet Protocol Version 4, Src: 10.0.47.110 (10.0.47.110), Dst:
10.50.47.30 (10.50.47.30)
User Datagram Protocol, Src Port: 49194 (49194), Dst Port: 21374 (21374)
Real-Time Transport Protocol
    [Stream setup by SDP (frame 1122)]
        [Setup frame: 1122]
        [Setup Method: SDP]
    10.. .... = Version: RFC 1889 Version (2)
    ..0. .... = Padding: False
    ...0 .... = Extension: False
    .... 0000 = Contributing source identifiers count: 0
    1... .... = Marker: True
    Payload type: telephone-event (101)
    Sequence number: 26364
    [Extended sequence number: 91900]
    Timestamp: 133920
    Synchronization Source identifier: 0x03bf0676 (62850678)
RFC 2833 RTP Event
    Event ID: DTMF One 1 (1)
    0... .... = End of Event: False
    .0.. .... = Reserved: False
    ..00 1010 = Volume: 10
    Event Duration: 0

*ALEG SECOND EVENT FROM SIP UA TO FREESWITCH*

No.     Time Source                Destination           Protocol Length
Info
   5255 23   10.0.47.110           10.50.47.30           RTP EVENT 60
Payload type=RTP Event, DTMF One 1

Frame 5255: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)
Ethernet II, Src: Sonicwal_3d:2b:1c (00:06:b1:3d:2b:1c), Dst:
Vmware_ab:60:ec (00:0c:29:ab:60:ec)
Internet Protocol Version 4, Src: 10.0.47.110 (10.0.47.110), Dst:
10.50.47.30 (10.50.47.30)
User Datagram Protocol, Src Port: 49194 (49194), Dst Port: 21374 (21374)
Real-Time Transport Protocol
    [Stream setup by SDP (frame 1122)]
        [Setup frame: 1122]
        [Setup Method: SDP]
    10.. .... = Version: RFC 1889 Version (2)
    ..0. .... = Padding: False
    ...0 .... = Extension: False
    .... 0000 = Contributing source identifiers count: 0
    0... .... = Marker: False
    Payload type: telephone-event (101)
    Sequence number: 26365
    [Extended sequence number: 91901]
    Timestamp: 133920
    Synchronization Source identifier: 0x03bf0676 (62850678)
RFC 2833 RTP Event
    Event ID: DTMF One 1 (1)
    0... .... = End of Event: False
    .0.. .... = Reserved: False
    ..00 1010 = Volume: 10
    Event Duration: 160

*BLEG FIRST EVENT FROM FREESWITCH* *TO CISCO*
No.     Time Source                Destination           Protocol Length
Info
   5329 23   10.50.47.30           10.50.47.19           RTP EVENT 58
Payload type=RTP Event, DTMF One 1

Frame 5329: 58 bytes on wire (464 bits), 58 bytes captured (464 bits)
Ethernet II, Src: Vmware_ab:60:ec (00:0c:29:ab:60:ec), Dst:
64:9e:f3:11:ff:60 (64:9e:f3:11:ff:60)
Internet Protocol Version 4, Src: 10.50.47.30 (10.50.47.30), Dst:
10.50.47.19 (10.50.47.19)
User Datagram Protocol, Src Port: 24034 (24034), Dst Port: 18768 (18768)
Real-Time Transport Protocol
    [Stream setup by SDP (frame 1113)]
        [Setup frame: 1113]
        [Setup Method: SDP]
    10.. .... = Version: RFC 1889 Version (2)
    ..0. .... = Padding: False
    ...0 .... = Extension: False
    .... 0000 = Contributing source identifiers count: 0
    0... .... = Marker: False
    Payload type: telephone-event (101)
    Sequence number: 24716
    [Extended sequence number: 90252]
    Timestamp: 158240
    Synchronization Source identifier: 0x57e5d7a1 (1474680737)
RFC 2833 RTP Event
    Event ID: DTMF One 1 (1)
    0... .... = End of Event: False
    .0.. .... = Reserved: False
    ..00 0111 = Volume: 7
    Event Duration: 80

*BLEG SECOND EVENT FROM FREESWITCH* *TO CISCO*
No.     Time Source                Destination           Protocol Length
Info
   5331 23   10.50.47.30           10.50.47.19           RTP EVENT 58
Payload type=RTP Event, DTMF One 1

Frame 5331: 58 bytes on wire (464 bits), 58 bytes captured (464 bits)
Ethernet II, Src: Vmware_ab:60:ec (00:0c:29:ab:60:ec), Dst:
64:9e:f3:11:ff:60 (64:9e:f3:11:ff:60)
Internet Protocol Version 4, Src: 10.50.47.30 (10.50.47.30), Dst:
10.50.47.19 (10.50.47.19)
User Datagram Protocol, Src Port: 24034 (24034), Dst Port: 18768 (18768)
Real-Time Transport Protocol
    [Stream setup by SDP (frame 1113)]
        [Setup frame: 1113]
        [Setup Method: SDP]
    10.. .... = Version: RFC 1889 Version (2)
    ..0. .... = Padding: False
    ...0 .... = Extension: False
    .... 0000 = Contributing source identifiers count: 0
    0... .... = Marker: False
    Payload type: telephone-event (101)
    Sequence number: 24717
    [Extended sequence number: 90253]
    Timestamp: 158240
    Synchronization Source identifier: 0x57e5d7a1 (1474680737)
RFC 2833 RTP Event
    Event ID: DTMF One 1 (1)
    0... .... = End of Event: False
    .0.. .... = Reserved: False
    ..00 0111 = Volume: 7
    Event Duration: 160
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