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Call Setup time in GSM

Wallis Dudhnath - 10th April 2017  (07:29 GMT)

As highlighted compared to other GSM nodes, the EIR is not mandatory. Several GSM Networks were launched without an EIR.

To reduce on SCCP signalling messages (e.g. CheckIMEI()) the MSC/VLRs can be configured so that a query to the EIR will not be required for every call, i.e. the query requests can be reduced.

VBR/ Wallis Dudhnath

pix - 9th April 2017  (16:51 GMT)

Hi Ayat,

IMEI authentication may not be mandatory (in your country), so you could by-pass it. The only drawback is the lesser security when setting up calls, and the inability to know the handset model from a call trace.

Regarding security, there is probably a good reason to keep the IMEI check, but I'm not familiar with this aspect of things. If I were you, I would bring up the topic to security experts.

Regarding tracing, it depends if you're using massive probing servers such as Astellia. Showing the IMEI information for each call is a great way to isolate problematic handset models.

Finally, if your government or a private company tests your network and finds out that it is less protected that your competitors, it may
(1) play against you when they have to choose which operator to subscribe to.
(2) may be bad publicity.

The IMEI phase is not taking up so much time I think... It's a phase which is run in parallel to other phases, which means it doesn't "block" the call setup process (afaik). I wonder how much time you'd gain by removing it.


Ayat - 9th April 2017  (12:49 GMT)


in core level we enable identity request for MO , MT , and SMS MO ,SMS M and it cause delay in Call setup to we planing to disable it , do you think it will effect collecting IMEI in Our network
with existing EIR ,,any bad impact

as i know it is an optional and usually vendor like Huawei disable this message for service , keep it only on LOC

kranthi - 22nd January 2017  (08:38 GMT)

Hi ,

can any one provide the standard & standard specification where i can get GSM call flow in detail & time allowed by the standard ( 3GPP OR ETSI ) . Need in standard specification ( ETSI xxxx OR 3GPP xxxx) that has to use some where in my organisation

Sudhir - 20th November 2016  (04:42 GMT)

Call setup time calculation in tems logfile

priya - 23rd April 2015  (04:57 GMT)

how to get the call setup time for different networks like gps,gprs,umts. and there is any techniques to minimise the call setup time ?

gyana - 10th December 2013  (08:10 GMT)

we have rehomed some BSC From one SGSN to another new SGSN. and found call setup time increased while subsciber is in GPRS active mode in that SGSN.MT voice call is happening through Gs interface.

Kindly advice

Usman - 16th May 2013  (09:13 GMT)

For bigger and complex GSM networks, average time is 5.5 to 7 secs.

SURESH - 13th May 2011  (07:18 GMT)

Dear Garry,I am a research scholor working in the area of GSM networks. How to calculate the call setup time for a GSM network.

nux - 7th February 2011  (08:06 GMT)

hi all,

i also have some problem on call setup. for information, i get one cell re-homed from old BSC to new BSC. when i tried to make originating call, network could "ring" the opposite subscriber (so i think ISUP message has been received) but a few moments later it was disconnected with display in mobile "network unavailble".

i'm in charge at core network, can anybody tell me what alarm it is?

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Last modified: 17 May 2017

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