SIP error 481 Call Leg/Transaction Does Not Exist

[ggl277808]

Hi there,

We have a SIP Trunk directly to TISP (Without CUBE/GW) and I've been asked to filter incoming calls by Calling Party Numbers, so far everything works properly.

In addition I need to permit anonymous incoming calls and here is the issue.

I have implemented a Sip Script Normalization to modify the SIP Header for incoming calls and change the “anonymous” or “unavailable” words, because CUCM is not designed to match on non-numeric strings, so the call would fail.

I did everything following this guide:
https://www.byteworks.com/blog/calling-party-number-cpn-based-call-routing-using-cisco-unified-communications-manager-8-x-and-sip-gateway-protocol/

At this point the call is received but a few seconds later the anonymous calls are hung.

I collected the SIP Traces via RTMT but I can't figure out what may be causing this.

Please find attached the Sip log

Someone can give me some clue?

Thanks in advance

[ggl277808]

Could anyone have any idea from where to look about this issue please?

[R0g22]

Where did you take the trace from ? Does not look like a SDL trace ? Also, who is "172.16.95.201" ?

[ggl277808]

Hi Nipun,

Thanks for your response. I collected logs from RTMT in CUCM(172.16.95.201), sorry for my logs before, find attached the full logs.

Please add .gz after name.txt for each file (Valid extension restriction)

Thanks in advance

[ggl277808 · Accepted solution]

I've solved the issue in a different way, instead of block incoming numbers filtering via translation pattern and partition, css, ... I've create an Lua Script modifying the From and Contact headers for incoming calls with numbers to restrict, and it work perfect.