[cisco-voip] RTP packets not received at PC side

[Guan Yang]

Hi, I posted a few days ago about a problem I'm having with my Cisco 
2611, NM-2V and VIC-2BRI-S/T-TE. I'm trying to call the Cisco with my 
mobile phone and to call to the mobile phone with a softphone. The 
softphone is SJPhone running on a Windows laptop, although I've tried 
other softphones.

The packets are moving fine from laptop to 2611. When I speak into the 
laptop's microphone I can hear the sound excellently on my mobile. I can 
also see these packets in Ethereal.

The 2611 also claims to be transmitting RTP packets. However I can't see 
these packets in Ethereal and they don't appear to be received by the 
softphone -- when I speak into the mobile phone's microphone I don't 
hear anything on the laptop.

Here's an example of the debug voice rtp messages:

*Mar  3 03:55:22.269: RTP(2592): fs rx d=192.168.1.101(16384), pt=8, 
ts=24E0, s7
*Mar  3 03:55:22.281: RTP(8426): fs tx d=192.168.1.101(16384), pt=8, 
ts=293DC956
*Mar  3 03:55:22.301: RTP(8427): fs tx d=192.168.1.101(16384), pt=8, 
ts=293DC9F6
*Mar  3 03:55:22.321: RTP(8428): fs tx d=192.168.1.101(16384), pt=8, 
ts=293DCA96

In fact, the *only* packets sent from the 2611 are these (transcription 
from Ethereal screen):

SIP/SDP INVITE
SIP ACK
RTCP Sender Report
RTCP Sender Report
SIP 200 OK
RTCP Receiver Report
RTCP Receiver Report
ICMP Destination Unreachable

(over a 10-second call)

That last packet is a UDP Destination Unreachable error. Source port 
17923, destination port 16387.

I've pasted in my entire config (the only lines that are removed are the 
ones containing passwords). I'm positive that there's no kind of 
firewall running on the Windows laptop. Could there be some kind of 
problem on the 2611 that causes it not to send the packets?

Thanks,
Guan



Current configuration : 2203 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
no service dhcp
!
hostname jefferson
!
boot-start-marker
boot-end-marker
!
! enable secret
!
clock timezone CET 1
clock summer-time CEST recurring
no aaa new-model
ip subnet-zero
no ip routing
no ip cef
!
!
ip domain name unicast.org
ip name-server 192.168.1.103
ip name-server 212.54.64.170
ip name-server 212.54.64.171
!
isdn switch-type basic-net3
!
!
!
voice class codec 1
  codec preference 1 g711alaw
  codec preference 2 g729br8
  codec preference 3 g729r8
  codec preference 4 g723r63
  codec preference 5 g723r53
  codec preference 6 g711ulaw
!
voice class codec 2
  codec preference 1 gsmfr
  codec preference 2 gsmefr
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
  no ip address
!
interface Ethernet0/0
  ip address 192.168.1.102 255.255.255.0
  ip access-group 1 in
  ip access-group 1 out
  no ip route-cache
  no ip mroute-cache
  full-duplex
  no cdp enable
!
interface BRI0/0
  no ip address
  no ip route-cache
  no ip mroute-cache
  shutdown
  isdn switch-type basic-net3
  no cdp enable
!
interface Ethernet0/1
  ip address 192.168.1.102 255.255.255.0
  no ip route-cache
  no ip mroute-cache
  shutdown
  full-duplex
  no cdp enable
!
interface BRI1/0
  no ip address
  no ip route-cache
  isdn switch-type basic-net3
  isdn incoming-voice voice
  isdn answer1 32580668
  isdn calling-number 32848286
!
interface BRI1/1
  no ip address
  no ip route-cache
  shutdown
  isdn switch-type basic-net3
!
ip http server
ip classless
!
!
access-list 1 permit any
!
!
voice-port 1/0/0
  compand-type a-law
  cptone DK
!
voice-port 1/0/1
  compand-type a-law
  cptone DK
!
!
!
dial-peer voice 2 pots
  application session
  incoming called-number 32580668
  destination-pattern T
  direct-inward-dial
  port 1/0/0
!
dial-peer voice 1 voip
  application session
  destination-pattern 32580668
  voice-class codec 1
  session protocol sipv2
  session target sip-server
  session transport udp
  no vad
!
sip-ua
  sip-server ipv4:192.168.1.101
!
!
line con 0
  exec-timeout 0 0
line aux 0
line vty 0 4
! password
  login
!
!
!
end