Hello all,
I'm encountering a problem when trying to run tests with Asterisk. I have
created an Asterisk config such that:
SIPp (uac_pcap) <----> Asterisk <-----> SIPp (uas)
SIP traffic is flowing perfectly, however, I can't get RTP media to flow.
The media is leaving the uac_pcap instance of SIPp and then is rejected by
the Asterisk server with an ICMP packet saying that the destination UDP port
is not open.
The RTP port, to the best of my knowledge, is negotiated (and generally
dictated by the server) at the time of call construction via SIP. At this
point, I figured either that Asterisk was sending an incorrect UDP port for
media, or SIPp was ignoring this port.
After some tcpdumps and asterisk sip debugs, it looks to be the latter.
Asterisk is sending the SIPp client a five digit UDP port number, and SIPp
is then sending media to a four digit port, which is essentially the five
digit port with the last digit (1s digit) truncated.
Here is the output I am seeing:
Asterisk output specifying the RTP port:
"""""""""""""
<------------>
Audio is at 192.168.100.25 port 14272
Adding codec 0x8 (alaw) to SDP
Adding non-codec 0x1 (telephone-event) to SDP
pbx*CLI>
<--- Reliably Transmitting (NAT) to 192.168.100.156:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.100.156:5060;branch=z9hG4bK-16464-1-0;received=
192.168.100.156
From: sipp <sip:[EMAIL PROTECTED]:5060>;tag=16464SIPpTag091
To: sut <sip:[EMAIL PROTECTED]:5060>;tag=as462c2628
Call-ID: [EMAIL PROTECTED]
CSeq: 1 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[EMAIL PROTECTED] <[EMAIL PROTECTED]>>
Content-Type: application/sdp
Content-Length: 242
v=0
o=root 2124 2124 IN IP4 192.168.100.25
s=session
c=IN IP4 192.168.100.25
t=0 0
m=audio 14272 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv
""""""""""""""""
RTP traffic leaving SIPp computer(192.168.100.156) and going to asterisk(
192.168.100.25):
"""""""""""""
14:11:03.125895 IP 192.168.100.156.6000 > 192.168.100.25.1427: UDP, length
252
14:11:03.156076 IP 192.168.100.156.6000 > 192.168.100.25.1427: UDP, length
252
14:11:03.186269 IP 192.168.100.156.6000 > 192.168.100.25.1427: UDP, length
252
"""""""""""""
So 14272 was specified as the port, but SIPp is sending it to 14272. Here
are the two listings of parameters that I am using to start SIPp:
UAC:
sudo ./sipp -s s -sn uac_pcap -p 5060 -i 192.168.100.156 192.168.100.25 -r 0
-l 1 -mi 192.168.100.156
UAS:
./sipp -sn uas -p 5061 -mp 6001 -mi 192.168.100.156 -i 192.168.100.156-rtp_echo
Is this a bug, or am I doing something wrong? Ideas?
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