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Community Member

SIP trunk issue on CUCM 7!

Hi,

I am trying to setup a trunk on our CUCM 7, with a third party provider, I have got the user name/password and IP address to establish a sip trunk! I have only one route pattern which is 9.@ and I have selected SIP trunk as my gateway. I am trying to call from my IP phone, but I get cisco message, Call cannot be completed as dialed! Any help of setting this will be help full.

Thanks

18 REPLIES

Re: SIP trunk issue on CUCM 7!

Can you provide more information of the topology. Are you connecting directly to the provider from UCM or do you have a CUBE/SBC in the middle of the conversation?

Community Member

Re: SIP trunk issue on CUCM 7!

well.. we have 3800 router and ASA box, and service provider, but 3800 router is not our gateway. There is no CUBE/SBC installed in the middle.

If I take some calls traces, would that be help full ?

Thanks

Re: SIP trunk issue on CUCM 7!

As always traces do help a lot. Also, there have been issues with the inspect statements on the ASA. Make sure you have "inspect sip" in your policy on the ASA. Make sure you are not blocking traffic from the UCM to SIP Provider and vice versa. Here is a similar post that may help to look into the ASA.

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=IP%20Telephony&topicID=.ee6c829&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40^1%40%40.2cc270bc/6#selected_message

Re: SIP trunk issue on CUCM 7!

I see you're using a login with username and password, but do you know if your SIP provider requires registration?

Currently CUCM has a restriction regarding this. CUCM is capable of sending INVITEs with authentication, but is not capable of sending REGISTER messages and maintain registration.

This is something that you would need to put a CUBE in the middle for if needed.

-nick

Community Member

Re: SIP trunk issue on CUCM 7!

Thanks for your above information, The service provider provided the user name and password and I used these credentials in the SIP realm section.

Also I got the IP address of server provider to use it in the SIP trunk (destination section), I put the IP address, but still the provider says, that we can't see any packets coming from your site.

CCM--->3800--->ASA--->Internet---S-Provider.

CCM-----------Trunk------S-Provider!

Any idea would be help full.

Thanks

Community Member

Re: SIP trunk issue on CUCM 7!

Thanks for your above information, The service provider provided the user name and password and I used these credentials in the SIP realm section.

Also I got the IP address of server provider to use it in the SIP trunk (destination section), I put the IP address, but still the provider says, that we can't see any packets coming from your site.

CCM--->3800--->ASA--->Internet---S-Provider.

CCM-----------Trunk------S-Provider!

Any idea would be help full.

Thanks

Cisco Employee

Re: SIP trunk issue on CUCM 7!

Hi,

Is the provider expecting SIP on TCP or UDP? The default SIP trunk security profile is set to send SIP over TCP.

Also, when you have the following call flow

CCM--->3800--->ASA--->Internet---S-Provide

You configure the user/pass for SIP trunk on CUCM or 3800? And do you have SIP inspect on on the ASA?

Thanks,

Community Member

Re: SIP trunk issue on CUCM 7!

Thanks, well I select sip trunk option as a gateway in my Route pattern. I do not have sip inspect on my ASA, Do I need to configure SIP inspect ?

Thanks

Cisco Employee

Re: SIP trunk issue on CUCM 7!

Hi,

You will need SIP inspect turned on on ASA if you are doing NAT. If no NAT than SIP inspect can be disabled.

Also, where do you configure the SIP digest auth credentials? On CUCM or on 3800?

If you are point the SIP trunk from CUCM to SIP provider directly, than you will have to configure that on CUCM. If you are sending the trunk to 3800 and than have another trunk from 3800 to SIP provider, than you will need to set the digest auth credentials on 3800.

Thanks,

Community Member

Re: SIP trunk issue on CUCM 7!

Thanks, I have SIP Inspect enabled on the ASA 5510 & we are using NAT. Also I can ping the provider IP address from my network!

I have configured the user name/password in the SIP realm section on the CM. On CM I put the public IP address of the remote provider, which means I have direct SIP trunk between CM and service provider.

Thanks

Community Member

Re: SIP trunk issue on CUCM 7!

Hi After a big struggle, I have got the SIP trunk to third party is working now, If I ring the outside number/mobile via SIP trunk then mobile rings, when I pick the mobile, then no voice on both sites,

Any idea about that, what other parameters needs to be checked for that ?

Thanks

Community Member

Re: SIP trunk issue on CUCM 7!

Hi all,

I would like to implement these (CUMC->Sip Provider) inside my lab.

May I have more information on this?

Many Thanks!

Hang

Community Member

Re: SIP trunk issue on CUCM 7!

Hi,

Please, did you solve this issue? If yes, what did you do?

Thanks,

Ricardo

Community Member

Re: SIP trunk issue on CUCM 7!

Hello,

Can you please share your steps how to enable calls with SIP provider thru CUCM 7?

I have the exact situation like yours, and I'm getting message " your call cannot be completed...".

I'm trying to set up SIP trunk so my international calls can be routed thru SIP while Cisco 3845 with H323 gateway is dealing with E1 PRI lines. NAT is not enabled and I did SIP inspect on ASA 5520 but still no luck. I went to another place with my CUCM virtual machine where no firewall is applied and no NAT but still I wasn't able to make calls.

Any idea ?

Thanks

Community Member

Re: SIP trunk issue on CUCM 7!

Well,

Thanks for your email. In my case, I did not have router configured as our Gateway for E1/T1. Which means we did not have any E1/T1 PSTN lines. We were connected to the third party PSTN provider through MPLS network and they provided the IP their public IP address and SIP customer user/password. I configured SIP trunk between my CUCM 7 and the PSTN Provider (Avaya or 3com system). They were using UDP port 5060 and I was trying TCP port 5060, but I changed UDP port 5060 on my side and eventually they saw our SIP request messages. In the route pattern you can define your International digits/numbers and can select SIP as your gateway in the gateway list to go through. Hope this would help.

Rgds

Wahidayat007

Community Member

Re: SIP trunk issue on CUCM 7!

Hello Nick,

I've been wanting to use SIP directly from CUCM for a while now. Would you mind elaborating a bit on your statement above regarding the registration restriction? Is this something that might be available in future? I see this as a very useful method of routing calls in test/lab environments as there's no need for a gateway/cube.

Thanks, Johan

Re: SIP trunk issue on CUCM 7!

Hi Johan,

CUCM can send an invitation with authentication credentials but cannot send a REGISTER message. If your provider requires this then you will need CME/CUBE. This is a feature of smaller providers, so it's likely if you will be running the volume of a CUCM cluster over a SIP trunk it may be a non-issue.

-nick

Community Member

Re: SIP trunk issue on CUCM 7!

Well,

       Thanks for your email. In my case, I did not have router configured as our Gateway for E1/T1. Which means we did not have any E1/T1 PSTN lines. We were connected to the third party PSTN provider through MPLS network and they provided the IP their public IP address and SIP customer user/password. I configured SIP trunk between my CUCM 7 and the PSTN Provider (Avaya or 3com system). They were using UDP port 5060 and I was trying TCP port 5060, but I changed UDP port 5060 on my side and eventually they saw our SIP request messages. In the route pattern you can define your International digits/numbers and can select SIP as your gateway in the gateway list to go through. Hope this would help.

Rgds

Wahidayat007

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