10-12-2009 07:15 AM - edited 03-15-2019 08:01 PM
Hello,
I have a SIP DID from Vitelity connected to my 2821 H323 gateway and CUCM 7.1.
When I make a call over SIP I don't hear any ringback, but the call is routed correctly and the call works fine once the called-party answers.
Here is some of my gateway config;
-------------------------------------------
voice service voip
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
fax protocol cisco
h323
!
!
!
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g729r8
!
!
!
!
voice class h323 1
h225 timeout tcp establish 3
interface Loopback0
description ******H323 GATEWAY ADDRESS******
ip address 10.10.10.1 255.255.255.255
h323-gateway voip interface
h323-gateway voip h323-id C2821
h323-gateway voip bind srcaddr 10.10.10.1
dial-peer voice 1 voip
destination-pattern ..........
voice-class codec 1
session target ipv4:192.168.1.10
incoming called-number .
dtmf-relay h245-alphanumeric
no vad
!
dial-peer voice 2 voip
destination-pattern .T
progress_ind setup enable 3
progress_ind alert enable 8
voice-class codec 1
session protocol sipv2
session target sip-server
session transport udp
incoming called-number 9T
dtmf-relay rtp-nte
!
!
gateway
timer receive-rtp 1200
!
sip-ua
credentials username [removed] password 7 [removed] realm asterisk
authentication username [removed] password 7 [removed] realm asterisk
no remote-party-id
retry invite 2
retry register 2
registrar ipv4:140.239.143.5 expires 3600
sip-server ipv4:140.239.143.5
host-registrar
-------------------------------------------
Any ideas are appreciated, thanks in advance!
Solved! Go to Solution.
10-15-2009 05:58 PM
This isn't very easy to explain -
Your H323 side is not doing fast start and you're getting media in your 1xx message to the Asterisks.
You need to do media negotiation in order to hear ringback in this case. The gateway cannot send its media to the Asterisks in this case because it cannot send any type of response at this point in the call flow. If the Asterisks supported rel1xx messaging, you would be able to.
The only workaround is to check 'MTP Required' on the H323 gateway in CUCM and check 'Enable Outbound Faststart'.
If you're determined not to use MTPs, you will need to switch your trunk to CUCM to SIP. In 12.4(20)T and later you can use the CUBE feature 'DO-EO', which is the 'early-offer forced' command.
-nick
10-15-2009 06:46 PM
You should make sure that the codec you have chosen is being negotiated ( and available on the MTP). If you're trying to use G.729 you'll need a software MTP on a router.
Also make sure that the MRGL has access to the MTP. The INVITE that is sent to the PBX should have information under it, an SDP. It should include IP addresses, codecs, etc.
-nick
10-19-2009 09:06 AM
Hi , i got the issue resolved at one of our customer site.. we had to configure an IOS MTP and also restarted the IP Voice media streaming service
10-13-2009 06:00 AM
Try removing these commands from your dial peer:
progress_ind setup enable 3
progress_ind alert enable 8
and then post 'debug ccsip message'
-nick
10-13-2009 05:42 PM
I think this may be a bug/defect in 7.1 OR
CUCM 7.1 is not compatible with the router ISO you have running for your SIP trunk.
We've upgraded from 6.12 to 7.12 and this problem started with us...but only calling from 7.1 to CUBE/SIP trunk to the far end CUCM with UCCX. No ring back is the symptom for also.
Haven't had time to fix it yet.
10-15-2009 10:23 AM
Hi,
Can you assign the right Locale and also the annunciators in your MRGL which is assigend tothe trunk. This should solve the problem.
Thanks,
Sandeep
10-15-2009 04:16 PM
10-15-2009 05:58 PM
This isn't very easy to explain -
Your H323 side is not doing fast start and you're getting media in your 1xx message to the Asterisks.
You need to do media negotiation in order to hear ringback in this case. The gateway cannot send its media to the Asterisks in this case because it cannot send any type of response at this point in the call flow. If the Asterisks supported rel1xx messaging, you would be able to.
The only workaround is to check 'MTP Required' on the H323 gateway in CUCM and check 'Enable Outbound Faststart'.
If you're determined not to use MTPs, you will need to switch your trunk to CUCM to SIP. In 12.4(20)T and later you can use the CUBE feature 'DO-EO', which is the 'early-offer forced' command.
-nick
10-15-2009 06:34 PM
I checked "Enable Outbound Faststart" and "MTP Required", but I still don't hear ringback. I am using the default software MTP in CUCM 7.1. Do I need to configure one on my 2821 gateway?
10-15-2009 06:46 PM
You should make sure that the codec you have chosen is being negotiated ( and available on the MTP). If you're trying to use G.729 you'll need a software MTP on a router.
Also make sure that the MRGL has access to the MTP. The INVITE that is sent to the PBX should have information under it, an SDP. It should include IP addresses, codecs, etc.
-nick
10-15-2009 08:13 PM
Hi,
Just curious to know if you assigned the roght locale to the SIP trunk on callmanager and also ensure yo have the MRGL assigned to the SIP trunk and that MRGL should have the Annunciators
10-19-2009 09:06 AM
Hi , i got the issue resolved at one of our customer site.. we had to configure an IOS MTP and also restarted the IP Voice media streaming service
10-19-2009 09:08 AM
sshams007-
Thanks for the advice. I will try that and let you know how it works out.
10-20-2009 11:27 AM
The issue is now resolved! I'm now getting ringback for both inbound and outbound calls.
Here's what I did.
---Configured a hardware MTP on my Voice Gateway using a PVDM2-32
sccp ccm group 1
bind interface Loopback0
associate ccm 1 priority 1
associate profile 1 register GW_MTP
!
dspfarm profile 1 mtp
description Media Termination Point
codec g711ulaw
maximum sessions hardware 8
associate application SCCP
---Configured the MTP within CUCM as an "Cisco IOS Enhanced Software Media Termination Point"
---Made the following changes to my H323 gateway
checked "Media Termination Point Required"
checked "Enable Inbound FastStart"
checked "Enable Outbound FastStart"
After making those changes, ring back works. Thanks everyone!!
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