ARP table size can only limit an L2 Ethernet domain. 

Speaking about kamailio there are two possible limitations:
- Shared memory size (set by -m parameter) which obviously can't be more than RAM size.
- Performance. You can tune it by setting usrloc table size (hash_size parameter of usrloc module). Bigger hash table size means smaller collision domain and faster search/insert/delete operations.

On Wed, Sep 13, 2017 at 9:41 PM, Mojtaba <mespio@gmail.com> wrote:

Hi,
This restriction is not regarded to kamailio.
It is from arp table  in your linux. The default rows of the arp table is 1024. you should increase it more than 1024 rows.
With Regards.Mojtaba Esfanfiari.S

On 13 Sep 2017 23:05, "amit Kumar" <tomar.iitr@gmail.com> wrote:
Hi All,

kamctl ul show => show below result, does that mean max 1024 contact can be registered, if that is the case how to increase the max registration limit.

Domain:: location table=1024 records=2 max_slot=1

Thanks

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