One-Way Audio issue

[Mauro Tartara]

Dear all,

I have one way audio issue between PSTN - GW3845 - CM 6.1 - IP Phone (7911 and IPC)

I can read other posts here and guide provide by cisco (http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a008009484b.shtml
)

I do this about 20 times before open this question.

Debugging GW i see this:

Jul 18 16:18:41 UTC: RTP(2049): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=445469B4, ssrc=13F10401

Jul 18 16:18:41 UTC: RTP(4610): fs rx s=10.73.48.101(24592), d=10.73.4.1(16812), pt=0, ts=6711635D, ssrc=349D5B8C

Jul 18 16:18:41 UTC: RTP(2050): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=44546A54, ssrc=13F10401

Jul 18 16:18:41 UTC: RTP(4611): fs rx s=10.73.48.101(24592), d=10.73.4.1(16812), pt=0, ts=671163FD, ssrc=349D5B8C

Jul 18 16:18:41 UTC: RTP(2051): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=44546AF4, ssrc=13F10401

Jul 18 16:18:41 UTC: RTP(4612): fs rx s=10.73.48.101(24592), d=10.73.4.1(16812), pt=0, ts=6711649D, ssrc=349D5B8C

Jul 18 16:18:41 UTC: RTP(2052): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=44546B94, ssrc=13F10401

Jul 18 16:18:41 UTC: RTP(4613): fs rx s=10.73.48.101(24592), d=10.73.4.1(16812), pt=0, ts=6711653D, ssrc=349D5B8C

Jul 18 16:18:41 UTC: RTP(2053): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=44546C34, ssrc=13F10401

Jul 18 16:18:41 UTC: RTP(2054): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=44546CD4, ssrc=13F10401

Jul 18 16:18:41 UTC: RTP(4614): fs rx s=10.73.48.101(24592), d=10.73.4.1(16812), pt=0, ts=671165DD, ssrc=349D5B8C

Jul 18 16:18:41 UTC: RTP(4615): fs rx s=10.73.48.101(24592), d=10.73.4.1(16812), pt=0, ts=6711667D, ssrc=349D5B8C

Jul 18 16:18:41 UTC: RTP(2055): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=44546D74, ssrc=13F10401

Jul 18 16:18:41 UTC: RTP(4616): fs rx s=10.73.48.101(24592), d=10.73.4.1(16812), pt=0, ts=6711671D, ssrc=349D5B8C

Jul 18 16:18:41 UTC: RTP(2056): fs tx s=10.73.4.1(16812), d=10.73.48.101(24592), pt=0, ts=44546E14, ssrc=13F10401

Jul 18 16:18:41 UTC: voip_rtp_update_callinfo: first_pak=TRUE, new_ssrc=0, type=3

Jul 18 16:18:41 UTC:  voip_rtp_update_xmit_info

Jul 18 16:18:41 UTC:  voip_rtp_update_xmit_info, dstvdbptr: 671B9E40, dstCallID 7388, gccb: 71282B60, xmitFunc 6183DDA4,context 69BAF96C

Jul 18 16:18:41 UTC:  voip_rtp_update_xmit_info Xmit Info node current values xmit_info->dstvdbptr: 671B9E40, xmit_info->dstCallID 7388, xmit_info->xmitFunc 6183DDA4, xmit_info->context 69BAF96C

Jul 18 16:18:41 UTC:  voip xmit info count: 1

Jul 18 16:18:41 UTC: voip_rtp_stop_disc_timer

Jul 18 16:18:41 UTC: voip_rtp_update_callinfo: first_pak=TRUE, new_ssrc=0, type=3

Jul 18 16:18:41 UTC:  voip_rtp_update_xmit_info

Jul 18 16:18:41 UTC:  voip_rtp_update_xmit_info, dstvdbptr: 671B9E40, dstCallID 7388, gccb: 71282B60, xmitFunc 0,context 69BAF96C

Jul 18 16:18:41 UTC:  voip_rtp_update_xmit_info xmit_func is NULL

Jul 18 16:18:41 UTC: voip_rtp_stop_disc_timer

Jul 18 16:18:41 UTC: voip_rtcp_remove_ccb

Jul 18 16:18:41 UTC: voip_rtcp_close_session

Jul 18 16:18:41 UTC: voip_rtcp_stop_session:

Jul 18 16:18:41 UTC: voip_rtcp_stop_session: stop session

Jul 18 16:18:41 UTC: Cleaning up sess=684D040C, sp=16812, dp=24592

Where:

10.73.48.101 is my Ip Communicator (its the same issue on the same vlan)

10.73.4.1 Interface GigabitEthernet bind h323-gateway.

From PSTN (10.73.4.1) i have no audio but i can hear the ip phone (10.73.48.101)

Log from phones say "Zero RTP packets received in X seconds"

I attach the show run, show call his voice brief, and if you need something just ask me.

[paolo bevilacqua]

Are phones and GW in the same subnet? If not, check your routing.

[Mauro Tartara]

"10.73.48.101 is my Ip Communicator (its the same issue on the same vlan)"

I have the same problem with ip phones 7911 on the same subnet

its the same with 10.73.48.101 or 10.73.4.11

[acampbell]

Mauro,

Looking at what you have shown so far.

We can see that gateway is sending and receiving RTP OK.

The IP phone does not receive the RTP.

The gateway routes to the phones on a static route

(from your show run)

ip route 10.73.0.0 255.255.0.0 10.73.0.3

This goes out on the gateway router via

!

interface GigabitEthernet0/0.73

description Troncal LAN-NUEVA

encapsulation dot1Q 73

ip address 10.73.0.1 255.255.255.0

!

Check that the routing to the phones is good from

the next hop 10.73.0.3 device

Regards,
Alex.
Please rate useful posts.

[Mauro Tartara]

Yes, thats correct. Next hop is 10.73.0.3.

its a 3750 layer 3 with interface vlan 100 with ip address 10.73.4.2

Its something like this.

PSTN --- GW --- 3750   And from this core switch -- CM and phones

In addition,

sh ip route | inc 10.73.4

C       10.73.4.0/22 is directly connected, GigabitEthernet0/0.100

[acampbell]

Mauro,

So the routing looks OK

The only other bother I have had with One Way XM is

when Firewalls have been in the routing

I see you have all kinds of secuirty inpection etc

Like the H323 interface

!

interface GigabitEthernet0/0.100

description ## TELEFONIA ##

encapsulation dot1Q 100

ip address 10.73.4.1 255.255.252.0

zone-member security LAN

h323-gateway voip interface

h323-gateway voip bind srcaddr 10.73.4.1

!

Can you make sure that UDP ports 16384 - 32768 are allowed

.

I am not a security or Firewall man

so I cant help much there

Regards,
Alex.
Please rate useful posts.

[Mauro Tartara]

Hey guys, i find the problem.

In this document:

http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a00808bc994.shtml

Note: Some services (particularly routers’ voice-over-IP services) use ephemeral or non-configurable interfaces that cannot be assigned to security zones. These services might not function properly if their traffic cannot be associated with a configured security zone.

So the controller e1 cannot be associated to security zone.

Solution:

Remove sub-interface GigabitEthernet0/0.100 (VoIP interface) from security Zone

I really appreciate your help.

Thanks people!