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no internal Audio on voip call behind ASA

Posted on 2010-09-15
Medium Priority
Last Modified: 2012-08-13
I have configured a Cisco 7942 IP Phone behind a ASA5505. the phone has registered with the call managers and I can make and recieve calls from the outside just fine. However if I call internally phone to phone I get no audio in either direction. I have enabled the "same-security-traffic permit intra-interface" command to allow for hairpinning as well. Also added inspect statements for SIP and SKINNY. see config.....

ASA Version 8.2(2)4
hostname Test
domain-name ad.davey-tree.com
enable password vOigZlIColYWIF/6 encrypted
passwd vOigZlIColYWIF/6 encrypted
interface Vlan1
 nameif inside
 security-level 100
 ip address
interface Vlan2
 nameif outside
 security-level 0
 ip address dhcp setroute
interface Ethernet0/0
 switchport access vlan 2
interface Ethernet0/1

interface Ethernet0/2
interface Ethernet0/3
interface Ethernet0/4
interface Ethernet0/5
interface Ethernet0/6
interface Ethernet0/7
boot system disk0:/asa822-4-k8.bin
ftp mode passive
dns server-group DefaultDNS
 domain-name ad.davey-tree.com
same-security-traffic permit intra-interface
access-list IPsec-traffic extended permit ip
access-list nonat extended permit ip
pager lines 24
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
icmp permit any inside

icmp permit any echo-reply outside
asdm image disk0:/asdm-625.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list nonat
nat (inside) 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
dynamic-access-policy-record DfltAccessPolicy
url-server (inside) vendor websense host timeout 30 protocol TCP version 4 connections 5
url-cache dst 128
filter url http allow longurl-truncate
filter url 443 allow
http server enable
http inside
http inside
http inside
http inside
snmp-server host inside community *****

no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ASA esp-3des esp-md5-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto map IPSEC 10 match address IPsec-traffic
crypto map IPSEC 10 set peer
crypto map IPSEC 10 set transform-set ASA
crypto map IPSEC 10 set security-association lifetime seconds 28800
crypto map IPSEC interface outside
crypto isakmp identity address
crypto isakmp enable outside
crypto isakmp policy 10
 authentication pre-share
 encryption 3des
 hash md5
 group 2
 lifetime 86400
crypto isakmp policy 65535
 authentication pre-share
 encryption 3des
 hash sha
 group 2
 lifetime 86400
telnet timeout 5
ssh inside
ssh timeout 5
console timeout 0
management-access inside
dhcpd dns
dhcpd wins
dhcpd domain ad.davey-tree.com
dhcpd auto_config outside
dhcpd option 150 ip
dhcpd address inside
dhcpd enable inside

no threat-detection basic-threat
no threat-detection statistics access-list
no threat-detection statistics tcp-intercept
url-block url-mempool 1500
url-block url-size 4
tftp-server inside /
tunnel-group type ipsec-l2l

tunnel-group ipsec-attributes
 pre-shared-key *****
class-map inspection_default
 match default-inspection-traffic
policy-map type inspect dns preset_dns_map
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect netbios
  inspect rsh
  inspect rtsp
  inspect skinny  
  inspect esmtp
  inspect sqlnet
  inspect sunrpc
  inspect tftp
  inspect sip  
  inspect xdmcp
  inspect icmp
service-policy global_policy global
prompt hostname context
 profile CiscoTAC-1
  no active
  destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService
  destination address email callhome@cisco.com
  destination transport-method http
  subscribe-to-alert-group diagnostic
  subscribe-to-alert-group environment
  subscribe-to-alert-group inventory periodic monthly
  subscribe-to-alert-group configuration periodic monthly
  subscribe-to-alert-group telemetry periodic daily
: end
Question by:dtadmin
  • 7
  • 6
LVL 33

Expert Comment

ID: 33683024
If the phones can establish a call, but not transfer audio, its usually an Access-list issue.   But I'm a little confused as to the layout of the network.     I only see the one vlan interface on the ASA for inside, but you have more subnets defined 10.30. and 10.1 .     Is there a 2nd gateway out of the 10.30 subnet?  

Author Comment

ID: 33683644
no. the ASA only has one subnet behind it. The other you see in the ACL was me playing around trying to get it to work.

Author Comment

ID: 33683652
actually the 10.30 subnet is the asa at the remote site.
the 10.1 subnet is my corporate subnet where the call managers reside.
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LVL 33

Expert Comment

ID: 33683805
Are these phones registering via SIP outside the network or are they using a call manager inside the network?  

So the phones are registering via SIP and can establish a call, but no audio back and forth correct?  If the call is established, then the PBX has done its work, and now the traffic is from phone to phone directly.    

Question:   if you make a call outside the network, doe sit work correctly?  

Question:  if you take the 2nd phone outside the network, does it work correctly?


Author Comment

ID: 33683828
they are registering to a call manager inside the network.

Yes. When I make a call from the ip phone behind the ASA to my cell phone the call completes with audio.
LVL 33

Expert Comment

ID: 33685218
If they are registering to a call manager on the same subnet, then when the call is established, the CCM is done.  After that, its phone to phone.     Are the phones on same subnet?   can the phones ping each other?   What codec are you using?  Is it the same on both phones?

Author Comment

ID: 33685244
the phones are on separate subnets. The phone behind the asa is on the subnet; the phone at my corporate office is on a subnet. I am using G.711 codec all the way through.
LVL 33

Expert Comment

ID: 33685344
OK, where is the network in relation to the 10.30.254 network, because I see no routing on the ASA....     Is there another gateway?   How are the packets routed?   What device is in between the 2 networks?    

Has this ever worked before or is this a new setup?

Author Comment

ID: 33685357
new setup....
the 10.30.254 network is behind an asa5505 remote office which is connected to our corporate asa5520 via dynamic VPN tunnel. the 10.2.0 network is located at my corporate office.

Author Comment

ID: 33685440
i added the 10.2 network to my ipsec and nonat ACL's on the 5505; maybe I need to add the 10.2 subnet to the nonat ACL on my corporate asa????
LVL 33

Accepted Solution

MikeKane earned 2000 total points
ID: 33685652
On the ASA tunnels, both sides must be no-nat'ed for traffic to flow correctly.    

Author Comment

ID: 33685686
roger. I'll modify the ACL's on the corporate side and update this thread.
LVL 33

Expert Comment

ID: 33725753
Any Luck?

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