Hi everyone,
We are testing cisco gear (UC520, UC540, C2811, C2911, C3945) with one of our providers. We have a problem with sip trunk registration.
topology:
[CISCO GW or UC520] <--via sip trunk--> [SIP proxy-provider] <--via sip trunk--> [Siemens HiQ]
Problem is that we are registering via sip proxy on the providers side. The proxy recieves the first registration attempt with TAG1 in the from field and has 360 seconds of registration time, and forwards it to siemens HiQ. Siemens ACK the registration and replies to sip proxy with 360 seconds of registration interval for tag1. Sip proxy does not forward the 200 OK with 360 seconds, but forwards the 200 OK with 50 seconds registration interval to cisco UC520 for tag1.
After 50 seconds uc520 tries to re-register again and sends a Register request for 360 seconds with tag2 in the from field. And because of that sip proxy does not re-registers the same account for another 50 seconds, but it forwards it to Siemens again - as a new registration. After 50 seconds and with third re-register and a third tag, we end up with too many simultaneous registrations, and the account is blocked.
Here is the configuration:
IOS version is 15.1
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voice service voip
ip address trusted list
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
fax protocol t38 version 0 ls-redundancy 2 hs-redundancy 0 fallback pass-through g711alaw
sip
min-se 360 session-expires 800
registrar server expires max 50 min 360
early-offer forced
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sip-ua
credentials number <xxxxxxxx> username <xxxxxxxx> password 7 <xxxxxxxx> realm bt.mobile.net
authentication username <xxxxxxxx> password 7 <xxxxxxxx> realm bt.mobile.net
no remote-party-id
retry invite 3
retry register 3
timers trying 150
registrar 1 dns:bt.mobile.net expires 360
host-registrar
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I thank you all in advance for all your helpfull posts!
Take care,
Ales
