> > Hi Joshua, > Thank you for looking into this.
> Their response IS based on traces I've sent them. Attached is such trace in text format (server IP has been changed to 111.111.111.111). Some repeating RTP packets has been truncated. You can see that after the 200 OK SSRC is sent from the server to the phone as '0x0'. The same has happened with G729 codec. > Let me know if you need the full trace or anything else from my side. > I should also mention that this is Asterisk version 1.8.12.1 > Thank you > Harel > ------------------------------ > On Tue, Nov 14, 2017, at 09:14 AM, Harel Cohen wrote: > > Hello, > > I have a problem where on an outgoing call a Grandstream phone > > (GXP2130) closes the incoming voice stream about 1 second into the > > call (the remote party hears the Grandstream, the Grandstream doesn't > > hear thr remote party). I have verified with logs and traces that this > > is not a NAT issue or any other network-related problem. All incoming > > RTP packets arrive at the phone on the correct port etc. as declared in the SDP. > > I opened a ticket with Grandstream and they replied: " > > > > *the phone starts receiving RTP with SSRC =0x0 which is wrong".* > > > > Is this an Asterisk problem or the phones? Is this something that can > > be fixed on the Asterisk side? > Asterisk would be sending the RTP to the Grandstream. I'd suggest getting a packet capture using tcpdump or wireshark to confirm what they've said though. I just looked at the code and I don't see a way that we'd ever have the SSRC be 0. > Cheers, > -- > Joshua Colp > Digium, Inc. | Senior Software Developer > 445 Jan Davis Drive NW - Huntsville, AL 35806 - US Check us out at: www.digium.com & www.asterisk.org > >
No. Time Source Destination Protocol Length Info 1 0.000000 1224 <Ignored> Frame 1: 1224 bytes on wire (9792 bits), 1224 bytes captured (9792 bits) This frame is marked as ignored No. Time Source Destination Protocol Length Info 2 0.078267 195.191.156.50 192.168.10.144 SIP 631 Status: 401 Unauthorized | Frame 2: 631 bytes on wire (5048 bits), 631 bytes captured (5048 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 55060, Dst Port: 21321 Session Initiation Protocol (401) No. Time Source Destination Protocol Length Info 3 0.090271 192.168.10.144 195.191.156.50 SIP 431 Request: ACK sip:0035699143...@sip1.mayorcom.com:55060 | Frame 3: 431 bytes on wire (3448 bits), 431 bytes captured (3448 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 21321, Dst Port: 55060 Session Initiation Protocol (ACK) No. Time Source Destination Protocol Length Info 4 0.120599 192.168.10.144 195.191.156.50 SIP/SDP 1427 Request: INVITE sip:0035699143...@sip1.mayorcom.com:55060 | Frame 4: 1427 bytes on wire (11416 bits), 1427 bytes captured (11416 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 21321, Dst Port: 55060 Session Initiation Protocol (INVITE) No. Time Source Destination Protocol Length Info 5 0.200309 195.191.156.50 192.168.10.144 SIP 576 Status: 100 Trying | Frame 5: 576 bytes on wire (4608 bits), 576 bytes captured (4608 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 55060, Dst Port: 21321 Session Initiation Protocol (100) No. Time Source Destination Protocol Length Info 6 1.742472 195.191.156.50 192.168.10.144 SIP/SDP 883 Status: 183 Session Progress | Frame 6: 883 bytes on wire (7064 bits), 883 bytes captured (7064 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 55060, Dst Port: 21321 Session Initiation Protocol (183) No. Time Source Destination Protocol Length Info 7 1.930997 192.168.10.144 195.191.156.50 RTP 214 PT=ITU-T G.711 PCMA, SSRC=0x254908E, Seq=39013, Time=3930400, Mark Frame 7: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 57514, Dst Port: 14520 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 8 2.022842 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x146F3B81, Seq=16905, Time=718143728 Frame 8: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 9 5.568285 192.168.10.144 195.191.156.50 RTP 214 PT=ITU-T G.711 PCMA, SSRC=0x254908E, Seq=39195, Time=3959520 Frame 9: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 57514, Dst Port: 14520 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 38 5.862609 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x146F3B81, Seq=17097, Time=718174448 Frame 38: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 39 5.870949 192.168.10.144 195.191.156.50 RTP 214 PT=ITU-T G.711 PCMA, SSRC=0x254908E, Seq=39210, Time=3961920 Frame 39: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 57514, Dst Port: 14520 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 40 5.883135 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x146F3B81, Seq=17098, Time=718174608 Frame 40: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 41 5.889643 195.191.156.50 192.168.10.144 SIP/SDP 869 Status: 200 OK | Frame 41: 869 bytes on wire (6952 bits), 869 bytes captured (6952 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 55060, Dst Port: 21321 Session Initiation Protocol (200) No. Time Source Destination Protocol Length Info 42 5.889846 192.168.10.144 195.191.156.50 RTP 214 PT=ITU-T G.711 PCMA, SSRC=0x254908E, Seq=39211, Time=3962080 Frame 42: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 57514, Dst Port: 14520 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 43 5.903619 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32665, Time=718174772, Mark Frame 43: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 44 5.912239 192.168.10.144 195.191.156.50 RTP 214 PT=ITU-T G.711 PCMA, SSRC=0x254908E, Seq=39212, Time=3962240 Frame 44: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 57514, Dst Port: 14520 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 51 5.982884 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32669, Time=718175412 Frame 51: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 52 5.993549 192.168.10.144 195.191.156.50 RTP 214 PT=ITU-T G.711 PCMA, SSRC=0x254908E, Seq=39216, Time=3962880 Frame 52: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 57514, Dst Port: 14520 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 53 5.993605 192.168.10.144 195.191.156.50 RTCP 54 Goodbye Frame 53: 54 bytes on wire (432 bits), 54 bytes captured (432 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 57515, Dst Port: 14521 Real-time Transport Control Protocol (Goodbye) [RTCP frame length check: OK - 12 bytes] No. Time Source Destination Protocol Length Info 54 6.002662 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32670, Time=718175572 Frame 54: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 55 6.022826 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32671, Time=718175732 Frame 55: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 56 6.042641 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32672, Time=718175892 Frame 56: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 57 6.062909 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32673, Time=718176052 Frame 57: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 58 6.082884 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32674, Time=718176212 Frame 58: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 59 6.102631 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32675, Time=718176372 Frame 59: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 60 6.119574 192.168.10.144 195.191.156.50 SIP 648 Request: ACK sip:0035699143960@195.191.156.50:55060 | Frame 60: 648 bytes on wire (5184 bits), 648 bytes captured (5184 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 21321, Dst Port: 55060 Session Initiation Protocol (ACK) No. Time Source Destination Protocol Length Info 61 6.122854 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32676, Time=718176532 Frame 61: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 62 6.146394 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32677, Time=718176692 Frame 62: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 69 6.282889 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32684, Time=718177812 Frame 69: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 70 6.302859 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32685, Time=718177972 Frame 70: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 71 6.322867 195.191.156.50 192.168.10.144 RTP 218 PT=ITU-T G.711 PCMA, SSRC=0x0, Seq=32686, Time=718178132 Frame 71: 218 bytes on wire (1744 bits), 218 bytes captured (1744 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 14520, Dst Port: 57514 Real-Time Transport Protocol No. Time Source Destination Protocol Length Info 72 14.692623 195.191.156.50 192.168.10.144 SIP 730 Request: BYE sip:000B82A7A0FA_1@81.63.183.29:21321 | Frame 72: 730 bytes on wire (5840 bits), 730 bytes captured (5840 bits) Ethernet II, Src: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c), Dst: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa) 802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 0 Internet Protocol Version 4, Src: 195.191.156.50, Dst: 192.168.10.144 User Datagram Protocol, Src Port: 55060, Dst Port: 21321 Session Initiation Protocol (BYE) No. Time Source Destination Protocol Length Info 73 14.730392 192.168.10.144 195.191.156.50 SIP 650 Status: 200 OK | Frame 73: 650 bytes on wire (5200 bits), 650 bytes captured (5200 bits) Ethernet II, Src: Grandstr_a7:a0:fa (00:0b:82:a7:a0:fa), Dst: 00:ff:6b:60:2c:4c (00:ff:6b:60:2c:4c) Internet Protocol Version 4, Src: 192.168.10.144, Dst: 195.191.156.50 User Datagram Protocol, Src Port: 21321, Dst Port: 55060 Session Initiation Protocol (200)
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