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</script>doi: 10.1002/bltj.10048
As the session initiation protocol (SIP) gets deployed, attention invariably needs to be paid to which SIP entities, user agents (UAs), proxies, back-to-back UAs (B2BUA), host services, and to what the impact is on the entity if the service causes it to fail. This paper discusses providing SIP services in terms of individual entities. We address how each of the entities participates in a SIP network and provides services in an individual capacity as well as part of the collective SIP network. © 2003 Lucent Technologies Inc.
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| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.  | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).  | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.  | Average | 
